diff --git a/code/__HELPERS/maths.dm b/code/__HELPERS/maths.dm
index b0312d44134..aa73b686b9d 100644
--- a/code/__HELPERS/maths.dm
+++ b/code/__HELPERS/maths.dm
@@ -110,3 +110,9 @@ var/gaussian_next
 		if(new_val < bound_lower)
 			new_val = min(orig_val, bound_lower)
 	return new_val
+
+// sqrt, but if you give it a negative number, you get 0 instead of a runtime
+/proc/sqrtor0(num)
+	if(num < 0)
+		return 0
+	return sqrt(num)
diff --git a/code/datums/diseases/advance/symptoms/choking.dm b/code/datums/diseases/advance/symptoms/choking.dm
index 172c4b63757..62e31105b92 100644
--- a/code/datums/diseases/advance/symptoms/choking.dm
+++ b/code/datums/diseases/advance/symptoms/choking.dm
@@ -43,11 +43,11 @@ Bonus
 	return
 
 /datum/symptom/choking/proc/Choke_stage_3_4(mob/living/M, datum/disease/advance/A)
-	var/get_damage = sqrt(21+A.totalStageSpeed()*0.5)+sqrt(16+A.totalStealth())
+	var/get_damage = sqrtor0(21+A.totalStageSpeed()*0.5)+sqrtor0(16+A.totalStealth())
 	M.adjustOxyLoss(get_damage)
 	return 1
 
 /datum/symptom/choking/proc/Choke(mob/living/M, datum/disease/advance/A)
-	var/get_damage = sqrt(21+A.totalStageSpeed()*0.5)+sqrt(16+A.totalStealth()*5)
+	var/get_damage = sqrtor0(21+A.totalStageSpeed()*0.5)+sqrtor0(16+A.totalStealth()*5)
 	M.adjustOxyLoss(get_damage)
 	return 1
\ No newline at end of file
diff --git a/code/datums/diseases/advance/symptoms/fever.dm b/code/datums/diseases/advance/symptoms/fever.dm
index 917ec9f3bf1..b19d821b75f 100644
--- a/code/datums/diseases/advance/symptoms/fever.dm
+++ b/code/datums/diseases/advance/symptoms/fever.dm
@@ -36,6 +36,6 @@ Bonus
 	return
 
 /datum/symptom/fever/proc/Heat(mob/living/M, datum/disease/advance/A)
-	var/get_heat = (sqrt(21+A.totalTransmittable()*2))+(sqrt(20+A.totalStageSpeed()*3))
+	var/get_heat = (sqrtor0(21+A.totalTransmittable()*2))+(sqrtor0(20+A.totalStageSpeed()*3))
 	M.bodytemperature = min(M.bodytemperature + (get_heat * A.stage), BODYTEMP_HEAT_DAMAGE_LIMIT - 1)
 	return 1
\ No newline at end of file
diff --git a/code/datums/diseases/advance/symptoms/fire.dm b/code/datums/diseases/advance/symptoms/fire.dm
index ad828efdd4c..1466bc86459 100644
--- a/code/datums/diseases/advance/symptoms/fire.dm
+++ b/code/datums/diseases/advance/symptoms/fire.dm
@@ -45,13 +45,13 @@ Bonus
 	return
 
 /datum/symptom/fire/proc/Firestacks_stage_4(mob/living/M, datum/disease/advance/A)
-	var/get_stacks = (sqrt(20+A.totalStageSpeed()*2))-(sqrt(16+A.totalStealth()))
+	var/get_stacks = (sqrtor0(20+A.totalStageSpeed()*2))-(sqrtor0(16+A.totalStealth()))
 	M.adjust_fire_stacks(get_stacks)
 	M.adjustFireLoss(get_stacks/2)
 	return 1
 
 /datum/symptom/fire/proc/Firestacks_stage_5(mob/living/M, datum/disease/advance/A)
-	var/get_stacks = (sqrt(20+A.totalStageSpeed()*3))-(sqrt(16+A.totalStealth()))
+	var/get_stacks = (sqrtor0(20+A.totalStageSpeed()*3))-(sqrtor0(16+A.totalStealth()))
 	M.adjust_fire_stacks(get_stacks)
 	M.adjustFireLoss(get_stacks)
 	return 1
\ No newline at end of file
diff --git a/code/datums/diseases/advance/symptoms/flesh_eating.dm b/code/datums/diseases/advance/symptoms/flesh_eating.dm
index e99f6f2835b..9cfdf8a9d34 100644
--- a/code/datums/diseases/advance/symptoms/flesh_eating.dm
+++ b/code/datums/diseases/advance/symptoms/flesh_eating.dm
@@ -38,6 +38,6 @@ Bonus
 	return
 
 /datum/symptom/flesh_eating/proc/Flesheat(mob/living/M, datum/disease/advance/A)
-	var/get_damage = ((sqrt(16-A.totalStealth()))*5)
+	var/get_damage = ((sqrtor0(16-A.totalStealth()))*5)
 	M.adjustBruteLoss(get_damage)
 	return 1
\ No newline at end of file
diff --git a/code/datums/diseases/advance/symptoms/heal.dm b/code/datums/diseases/advance/symptoms/heal.dm
index 11235d9a35b..007bbc92f0b 100644
--- a/code/datums/diseases/advance/symptoms/heal.dm
+++ b/code/datums/diseases/advance/symptoms/heal.dm
@@ -34,7 +34,7 @@ Bonus
 	return
 
 /datum/symptom/heal/proc/Heal(mob/living/M, datum/disease/advance/A)
-	var/get_damage = (sqrt(20+A.totalStageSpeed())*(1+rand()))
+	var/get_damage = (sqrtor0(20+A.totalStageSpeed())*(1+rand()))
 	M.adjustToxLoss(-get_damage)
 	return 1
 
@@ -148,7 +148,7 @@ Bonus
 	level = 5
 
 /datum/symptom/heal/dna/Heal(mob/living/carbon/M, datum/disease/advance/A)
-	var/amt_healed = (sqrt(20+A.totalStageSpeed()*(3+rand())))-(sqrt(16+A.totalStealth()*rand()))
+	var/amt_healed = (sqrtor0(20+A.totalStageSpeed()*(3+rand())))-(sqrtor0(16+A.totalStealth()*rand()))
 	M.adjustBrainLoss(-amt_healed)
 	//Non-power mutations, excluding race, so the virus does not force monkey -> human transformations.
 	var/list/unclean_mutations = (not_good_mutations|bad_mutations) - mutations_list[RACEMUT]
diff --git a/code/datums/diseases/advance/symptoms/shivering.dm b/code/datums/diseases/advance/symptoms/shivering.dm
index a26a19de048..d52a0a02256 100644
--- a/code/datums/diseases/advance/symptoms/shivering.dm
+++ b/code/datums/diseases/advance/symptoms/shivering.dm
@@ -35,6 +35,6 @@ Bonus
 	return
 
 /datum/symptom/shivering/proc/Chill(mob/living/M, datum/disease/advance/A)
-	var/get_cold = (sqrt(16+A.totalStealth()*2))+(sqrt(21+A.totalResistance()*2))
+	var/get_cold = (sqrtor0(16+A.totalStealth()*2))+(sqrtor0(21+A.totalResistance()*2))
 	M.bodytemperature = min(M.bodytemperature - (get_cold * A.stage), BODYTEMP_COLD_DAMAGE_LIMIT + 1)
 	return 1
\ No newline at end of file