diff --git a/code/datums/diseases/advance/symptoms/choking.dm b/code/datums/diseases/advance/symptoms/choking.dm
index f7f998f2b1..3e5b6ac2e1 100644
--- a/code/datums/diseases/advance/symptoms/choking.dm
+++ b/code/datums/diseases/advance/symptoms/choking.dm
@@ -32,7 +32,12 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/choking/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stage_rate"] >= 8)
 		symptom_delay_min = 7
 		symptom_delay_max = 24
@@ -100,7 +105,12 @@ Bonus
 	var/paralysis = FALSE
 
 /datum/symptom/asphyxiation/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stage_rate"] >= 8)
 		paralysis = TRUE
 	if(A.properties["transmission"] >= 8)
diff --git a/code/datums/diseases/advance/symptoms/confusion.dm b/code/datums/diseases/advance/symptoms/confusion.dm
index 2e252267c4..04418610e5 100644
--- a/code/datums/diseases/advance/symptoms/confusion.dm
+++ b/code/datums/diseases/advance/symptoms/confusion.dm
@@ -34,7 +34,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/confusion/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["resistance"] >= 6)
 		brain_damage = TRUE
 	if(A.properties["transmittable"] >= 6)
diff --git a/code/datums/diseases/advance/symptoms/cough.dm b/code/datums/diseases/advance/symptoms/cough.dm
index f0178576bf..d3c3ea2da8 100644
--- a/code/datums/diseases/advance/symptoms/cough.dm
+++ b/code/datums/diseases/advance/symptoms/cough.dm
@@ -36,7 +36,8 @@ BONUS
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/cough/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stealth"] >= 4)
 		suppress_warning = TRUE
 	if(A.spread_flags &= AIRBORNE) //infect bystanders
diff --git a/code/datums/diseases/advance/symptoms/deafness.dm b/code/datums/diseases/advance/symptoms/deafness.dm
index c43970563d..3bae01c7a7 100644
--- a/code/datums/diseases/advance/symptoms/deafness.dm
+++ b/code/datums/diseases/advance/symptoms/deafness.dm
@@ -32,7 +32,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/deafness/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stealth"] >= 4)
 		suppress_warning = TRUE
 	if(A.properties["resistance"] >= 9) //permanent deafness
diff --git a/code/datums/diseases/advance/symptoms/dizzy.dm b/code/datums/diseases/advance/symptoms/dizzy.dm
index cb1bf11e63..7d2a5a3bc6 100644
--- a/code/datums/diseases/advance/symptoms/dizzy.dm
+++ b/code/datums/diseases/advance/symptoms/dizzy.dm
@@ -31,7 +31,12 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/dizzy/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 4)
 		suppress_warning = TRUE
 	if(A.properties["transmittable"] >= 6) //druggy
diff --git a/code/datums/diseases/advance/symptoms/fever.dm b/code/datums/diseases/advance/symptoms/fever.dm
index 673835b0ed..d92fe0eef9 100644
--- a/code/datums/diseases/advance/symptoms/fever.dm
+++ b/code/datums/diseases/advance/symptoms/fever.dm
@@ -32,7 +32,12 @@ Bonus
 					  <b>Resistance 10:</b> Further increases fever intensity."
 
 /datum/symptom/fever/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["resistance"] >= 5) //dangerous fever
 		power = 1.5
 		unsafe = TRUE
diff --git a/code/datums/diseases/advance/symptoms/fire.dm b/code/datums/diseases/advance/symptoms/fire.dm
index e12e705350..781cd6de4d 100644
--- a/code/datums/diseases/advance/symptoms/fire.dm
+++ b/code/datums/diseases/advance/symptoms/fire.dm
@@ -35,7 +35,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/fire/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stage_rate"] >= 4)
 		power = 1.5
 	if(A.properties["stage_rate"] >= 8)
@@ -116,7 +117,8 @@ Bonus
 					  <b>Transmission 8:</b> Additionally synthesizes chlorine trifluoride and napalm inside the host."
 
 /datum/symptom/alkali/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["resistance"] >= 9) //intense but sporadic effect
 		power = 2
 		symptom_delay_min = 50
diff --git a/code/datums/diseases/advance/symptoms/flesh_eating.dm b/code/datums/diseases/advance/symptoms/flesh_eating.dm
index 16e2b5c065..65adb5559c 100644
--- a/code/datums/diseases/advance/symptoms/flesh_eating.dm
+++ b/code/datums/diseases/advance/symptoms/flesh_eating.dm
@@ -34,7 +34,12 @@ Bonus
 					  <b>Transmission 8:</b> Causes extreme pain to the host, weakening it."
 
 /datum/symptom/flesh_eating/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["resistance"] >= 7) //extra bleeding
 		bleed = TRUE
 	if(A.properties["transmittable"] >= 8) //extra stamina damage
@@ -99,7 +104,12 @@ Bonus
 					  <b>Stealth 5:</b> The symptom remains hidden until active."
 
 /datum/symptom/flesh_death/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 5)
 		suppress_warning = TRUE
 	if(A.properties["stage_rate"] >= 7) //bleeding and hunger
diff --git a/code/datums/diseases/advance/symptoms/genetics.dm b/code/datums/diseases/advance/symptoms/genetics.dm
index 1f654f2e97..c2e1eb78b2 100644
--- a/code/datums/diseases/advance/symptoms/genetics.dm
+++ b/code/datums/diseases/advance/symptoms/genetics.dm
@@ -45,11 +45,20 @@ Bonus
 			to_chat(C, "<span class='warning'>[pick("Your skin feels itchy.", "You feel light headed.")]</span>")
 			C.dna.remove_mutation_group(possible_mutations)
 			for(var/i in 1 to power)
+<<<<<<< HEAD
 				C.randmut(possible_mutations)
 
 // Archive their DNA before they were infected.
 /datum/symptom/genetic_mutation/Start(datum/disease/advance/A)
 	..()
+=======
+				C.randmut(possible_mutations)
+
+// Archive their DNA before they were infected.
+/datum/symptom/genetic_mutation/Start(datum/disease/advance/A)
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 5) //don't restore dna after curing
 		no_reset = TRUE
 	if(A.properties["stage_rate"] >= 10) //mutate more often
@@ -57,6 +66,7 @@ Bonus
 		symptom_delay_max = 60
 	if(A.properties["resistance"] >= 8) //mutate twice
 		power = 2
+<<<<<<< HEAD
 	possible_mutations = (GLOB.bad_mutations | GLOB.not_good_mutations) - GLOB.mutations_list[RACEMUT]
 	var/mob/living/carbon/M = A.affected_mob
 	if(M)
@@ -66,6 +76,19 @@ Bonus
 
 // Give them back their old DNA when cured.
 /datum/symptom/genetic_mutation/End(datum/disease/advance/A)
+=======
+	possible_mutations = (GLOB.bad_mutations | GLOB.not_good_mutations) - GLOB.mutations_list[RACEMUT]
+	var/mob/living/carbon/M = A.affected_mob
+	if(M)
+		if(!M.has_dna())
+			return
+		archived_dna = M.dna.struc_enzymes
+
+// Give them back their old DNA when cured.
+/datum/symptom/genetic_mutation/End(datum/disease/advance/A)
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(!no_reset)
 		var/mob/living/carbon/M = A.affected_mob
 		if(M && archived_dna)
diff --git a/code/datums/diseases/advance/symptoms/hallucigen.dm b/code/datums/diseases/advance/symptoms/hallucigen.dm
index d4cda525ad..8869d868ce 100644
--- a/code/datums/diseases/advance/symptoms/hallucigen.dm
+++ b/code/datums/diseases/advance/symptoms/hallucigen.dm
@@ -32,7 +32,12 @@ Bonus
 					  <b>Stealth 4:</b> The virus mimics positive symptoms.."
 
 /datum/symptom/hallucigen/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 4) //fake good symptom messages
 		fake_healthy = TRUE
 		base_message_chance = 50
diff --git a/code/datums/diseases/advance/symptoms/headache.dm b/code/datums/diseases/advance/symptoms/headache.dm
index b0665e0870..7317ecfb88 100644
--- a/code/datums/diseases/advance/symptoms/headache.dm
+++ b/code/datums/diseases/advance/symptoms/headache.dm
@@ -34,7 +34,12 @@ BONUS
 					  <b>Stealth 4:</b> Reduces headache frequency until later stages."
 
 /datum/symptom/headache/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 4)
 		base_message_chance = 50
 	if(A.properties["stage_rate"] >= 6) //severe pain
diff --git a/code/datums/diseases/advance/symptoms/heal.dm b/code/datums/diseases/advance/symptoms/heal.dm
index 869cea19da..4fba54121f 100644
--- a/code/datums/diseases/advance/symptoms/heal.dm
+++ b/code/datums/diseases/advance/symptoms/heal.dm
@@ -15,7 +15,8 @@
 					  <b>Stealth 4:</b> Healing will no longer be visible to onlookers."
 
 /datum/symptom/heal/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stealth"] >= 4) //invisible healing
 		hide_healing = TRUE
 	if(A.properties["stage_rate"] >= 6) //stronger healing
diff --git a/code/datums/diseases/advance/symptoms/itching.dm b/code/datums/diseases/advance/symptoms/itching.dm
index ea9156bfbd..dbe52a56fe 100644
--- a/code/datums/diseases/advance/symptoms/itching.dm
+++ b/code/datums/diseases/advance/symptoms/itching.dm
@@ -33,7 +33,12 @@ BONUS
 					  <b>Stage Speed 7:</b> The host will scrath itself when itching, causing superficial damage."
 
 /datum/symptom/itching/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["transmittable"] >= 6) //itch more often
 		symptom_delay_min = 1
 		symptom_delay_max = 4
diff --git a/code/datums/diseases/advance/symptoms/narcolepsy.dm b/code/datums/diseases/advance/symptoms/narcolepsy.dm
index d850d257cb..cc13d99406 100644
--- a/code/datums/diseases/advance/symptoms/narcolepsy.dm
+++ b/code/datums/diseases/advance/symptoms/narcolepsy.dm
@@ -30,7 +30,8 @@ Bonus
 					  <b>Resistance 10:</b> Causes narcolepsy more often, increasing the chance of the host falling asleep."
 
 /datum/symptom/narcolepsy/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["transmittable"] >= 7) //stamina damage
 		stamina = TRUE
 	if(A.properties["resistance"] >= 10) //act more often
diff --git a/code/datums/diseases/advance/symptoms/oxygen.dm b/code/datums/diseases/advance/symptoms/oxygen.dm
index da085ab153..850f7649ce 100644
--- a/code/datums/diseases/advance/symptoms/oxygen.dm
+++ b/code/datums/diseases/advance/symptoms/oxygen.dm
@@ -31,7 +31,12 @@ Bonus
 	threshold_desc = "<b>Resistance 8:</b>Additionally regenerates lost blood.<br>"
 
 /datum/symptom/oxygen/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["resistance"] >= 8) //blood regeneration
 		regenerate_blood = TRUE
 
diff --git a/code/datums/diseases/advance/symptoms/sensory.dm b/code/datums/diseases/advance/symptoms/sensory.dm
index dd417e50ed..e7edcff703 100644
--- a/code/datums/diseases/advance/symptoms/sensory.dm
+++ b/code/datums/diseases/advance/symptoms/sensory.dm
@@ -32,7 +32,8 @@ Bonus
 					  <b>Transmission 8:</b> Purges alcohol in the bloodstream."
 
 /datum/symptom/mind_restoration/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["resistance"] >= 6) //heal brain damage
 		brain_heal = TRUE
 	if(A.properties["transmittable"] >= 8) //purge alcohol
diff --git a/code/datums/diseases/advance/symptoms/shivering.dm b/code/datums/diseases/advance/symptoms/shivering.dm
index f40fd151d9..35d2d08cfa 100644
--- a/code/datums/diseases/advance/symptoms/shivering.dm
+++ b/code/datums/diseases/advance/symptoms/shivering.dm
@@ -31,7 +31,12 @@ Bonus
 					  <b>Stage Speed 10:</b> Further increases cooling speed."
 
 /datum/symptom/fever/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stage_speed"] >= 5) //dangerous cold
 		power = 1.5
 		unsafe = TRUE
diff --git a/code/datums/diseases/advance/symptoms/sneeze.dm b/code/datums/diseases/advance/symptoms/sneeze.dm
index 085b5ff592..8b5b59f71a 100644
--- a/code/datums/diseases/advance/symptoms/sneeze.dm
+++ b/code/datums/diseases/advance/symptoms/sneeze.dm
@@ -31,7 +31,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/sneeze/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["transmittable"] >= 9) //longer spread range
 		power = 2
 	if(A.properties["stealth"] >= 4)
diff --git a/code/datums/diseases/advance/symptoms/symptoms.dm b/code/datums/diseases/advance/symptoms/symptoms.dm
index 8557375dbd..38e9ba01ef 100644
--- a/code/datums/diseases/advance/symptoms/symptoms.dm
+++ b/code/datums/diseases/advance/symptoms/symptoms.dm
@@ -33,6 +33,7 @@
 	var/list/S = SSdisease.list_symptoms
 	for(var/i = 1; i <= S.len; i++)
 		if(type == S[i])
+<<<<<<< HEAD
 			id = "[i]"
 			return
 	CRASH("We couldn't assign an ID!")
@@ -46,6 +47,26 @@
 	return
 
 /datum/symptom/proc/Activate(datum/disease/advance/A)
+=======
+			id = "[i]"
+			return
+	CRASH("We couldn't assign an ID!")
+
+// Called when processing of the advance disease, which holds this symptom, starts.
+/datum/symptom/proc/Start(datum/disease/advance/A)
+	if(neutered)
+		return FALSE
+	next_activation = world.time + rand(symptom_delay_min * 10, symptom_delay_max * 10) //so it doesn't instantly activate on infection
+	return TRUE
+
+// Called when the advance disease is going to be deleted or when the advance disease stops processing.
+/datum/symptom/proc/End(datum/disease/advance/A)
+	if(neutered)
+		return FALSE
+	return TRUE
+
+/datum/symptom/proc/Activate(datum/disease/advance/A)
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(neutered)
 		return FALSE
 	if(world.time < next_activation)
diff --git a/code/datums/diseases/advance/symptoms/viral.dm b/code/datums/diseases/advance/symptoms/viral.dm
index ef8822470e..960ccd8096 100644
--- a/code/datums/diseases/advance/symptoms/viral.dm
+++ b/code/datums/diseases/advance/symptoms/viral.dm
@@ -97,7 +97,8 @@ Bonus
 		A.cure()
 
 /datum/symptom/viralreverse/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	A.stage = 5
 	if(A.properties["stealth"] >= 4) //more time before it's cured
 		power = 2
diff --git a/code/datums/diseases/advance/symptoms/vision.dm b/code/datums/diseases/advance/symptoms/vision.dm
index 04f5d72ba6..2f29091071 100644
--- a/code/datums/diseases/advance/symptoms/vision.dm
+++ b/code/datums/diseases/advance/symptoms/vision.dm
@@ -33,7 +33,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/visionloss/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stealth"] >= 4)
 		suppress_warning = TRUE
 	if(A.properties["resistance"] >= 12) //goodbye eyes
diff --git a/code/datums/diseases/advance/symptoms/voice_change.dm b/code/datums/diseases/advance/symptoms/voice_change.dm
index bdeb6321bc..c8ba639e48 100644
--- a/code/datums/diseases/advance/symptoms/voice_change.dm
+++ b/code/datums/diseases/advance/symptoms/voice_change.dm
@@ -36,7 +36,12 @@ Bonus
 					  <b>Stealth 3:</b> The symptom remains hidden until active."
 
 /datum/symptom/voice_change/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 3)
 		suppress_warning = TRUE
 	if(A.properties["stage_rate"] >= 7) //faster change of voice
diff --git a/code/datums/diseases/advance/symptoms/vomit.dm b/code/datums/diseases/advance/symptoms/vomit.dm
index 983d20a66d..e271bce5ed 100644
--- a/code/datums/diseases/advance/symptoms/vomit.dm
+++ b/code/datums/diseases/advance/symptoms/vomit.dm
@@ -39,7 +39,8 @@ Bonus
 					  <b>Stealth 4:</b> The symptom remains hidden until active."
 
 /datum/symptom/vomit/Start(datum/disease/advance/A)
-	..()
+	if(!..())
+		return
 	if(A.properties["stealth"] >= 4)
 		suppress_warning = TRUE
 	if(A.properties["resistance"] >= 7) //blood vomit
diff --git a/code/datums/diseases/advance/symptoms/weight.dm b/code/datums/diseases/advance/symptoms/weight.dm
index ea2577b800..90492299d1 100644
--- a/code/datums/diseases/advance/symptoms/weight.dm
+++ b/code/datums/diseases/advance/symptoms/weight.dm
@@ -31,7 +31,12 @@ Bonus
 	threshold_desc = "<b>Stealth 4:</b> The symptom is less noticeable."
 
 /datum/symptom/weight_gain/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 4) //warn less often
 		base_message_chance = 25
 
@@ -81,7 +86,12 @@ Bonus
 	threshold_desc = "<b>Stealth 4:</b> The symptom is less noticeable."
 
 /datum/symptom/weight_loss/Start(datum/disease/advance/A)
+<<<<<<< HEAD
 	..()
+=======
+	if(!..())
+		return
+>>>>>>> 1940af0... Fixes Start() of symptoms still working when neutered (#31435)
 	if(A.properties["stealth"] >= 4) //warn less often
 		base_message_chance = 25