diff --git a/code/__defines/mobs.dm b/code/__defines/mobs.dm
index f72337b96a3..182de847687 100644
--- a/code/__defines/mobs.dm
+++ b/code/__defines/mobs.dm
@@ -59,13 +59,10 @@
 #define PULSE_MAX_BPM 250 // Highest, readable BPM by machines and humans.
 
 // Blood pressure levels, simplified
-#define BP_HIGH_SYSTOLIC 		140
-#define BP_PRE_HIGH_SYSTOLIC 	125
-#define BP_IDEAL_SYSTOLIC		80
-
-#define BP_HIGH_DIASTOLIC 		100
-#define BP_PRE_HIGH_DIASTOLIC	85
-#define BP_IDEAL_DIASTOLIC 		60
+#define HIGH_BP_MOD 20
+#define PRE_HIGH_BP_MOD 5
+#define BP_SYS_IDEAL_MOD 40
+#define BP_DIS_IDEAL_MOD 20
 
 #define BLOOD_PRESSURE_HIGH     4
 #define BLOOD_PRESSURE_PRE_HIGH 3
diff --git a/code/modules/mob/living/carbon/human/human.dm b/code/modules/mob/living/carbon/human/human.dm
index b39d332b6dc..aefe180437f 100644
--- a/code/modules/mob/living/carbon/human/human.dm
+++ b/code/modules/mob/living/carbon/human/human.dm
@@ -1815,13 +1815,13 @@
 		if(PULSE_NONE)
 			return 0
 		if(PULSE_SLOW)
-			return rand(40, 60)
+			return rand(species.low_pulse, species.norm_pulse)
 		if(PULSE_NORM)
-			return rand(60, 90)
+			return rand(species.norm_pulse, species.fast_pulse)
 		if(PULSE_FAST)
-			return rand(90, 120)
+			return rand(species.fast_pulse, species.v_fast_pulse)
 		if(PULSE_2FAST)
-			return rand(120, 160)
+			return rand(species.v_fast_pulse, species.max_pulse)
 		if(PULSE_THREADY)
 			return PULSE_MAX_BPM
 	return 0
@@ -1855,9 +1855,9 @@
 //Get fluffy numbers
 /mob/living/carbon/human/proc/blood_pressure()
 	if(status_flags & FAKEDEATH)
-		return list(Floor(120+rand(-5,5))*0.25, Floor(80+rand(-5,5)*0.25))
+		return list(Floor(species.bp_base_systolic+rand(-5,5))*0.25, Floor(species.bp_base_disatolic+rand(-5,5)*0.25))
 	var/blood_result = get_blood_circulation()
-	return list(Floor((120+rand(-5,5))*(blood_result/100)), Floor((80+rand(-5,5))*(blood_result/100)))
+	return list(Floor((species.bp_base_systolic+rand(-5,5))*(blood_result/100)), Floor((species.bp_base_disatolic+rand(-5,5))*(blood_result/100)))
 
 //Formats blood pressure for text display
 /mob/living/carbon/human/proc/get_blood_pressure()
@@ -1866,30 +1866,32 @@
 
 //Works out blood pressure alert level -- not very accurate
 /mob/living/carbon/human/proc/get_blood_pressure_alert()
-	var/list/bp = blood_pressure()
+	var/list/bp_list = blood_pressure()
 	// For a blood pressure, e.g. 120/80
 	var/systolic_alert // this is the top number '120' -- highest pressure when heart beats
 	var/diastolic_alert // this is the bottom number '80' -- lowest pressure when heart relaxes
-
-	switch(bp[1])
-		if(BP_HIGH_SYSTOLIC to INFINITY)
-			systolic_alert = BLOOD_PRESSURE_HIGH
-		if(BP_PRE_HIGH_SYSTOLIC to BP_HIGH_SYSTOLIC)
-			systolic_alert = BLOOD_PRESSURE_PRE_HIGH
-		if(BP_IDEAL_SYSTOLIC to BP_PRE_HIGH_SYSTOLIC)
+	
+	var/blood_pressure_systolic = bp_list[1]
+	if (blood_pressure_systolic)
+		if (blood_pressure_systolic >= (species.bp_base_systolic - BP_SYS_IDEAL_MOD) && blood_pressure_systolic <= (species.bp_base_systolic + HIGH_BP_MOD))
 			systolic_alert = BLOOD_PRESSURE_IDEAL
-		if(-INFINITY to BP_IDEAL_SYSTOLIC)
+		else if (blood_pressure_systolic <= (species.bp_base_systolic - BP_SYS_IDEAL_MOD))
 			systolic_alert = BLOOD_PRESSURE_LOW
+		else if (blood_pressure_systolic >= (species.bp_base_systolic + PRE_HIGH_BP_MOD) && blood_pressure_systolic <= (species.bp_base_systolic + HIGH_BP_MOD))
+			systolic_alert = BLOOD_PRESSURE_PRE_HIGH
+		else if (blood_pressure_systolic >= (species.bp_base_systolic + HIGH_BP_MOD))
+			systolic_alert = BLOOD_PRESSURE_HIGH
 
-	switch(bp[2])
-		if(BP_HIGH_DIASTOLIC to INFINITY)
-			diastolic_alert = BLOOD_PRESSURE_HIGH
-		if(BP_PRE_HIGH_DIASTOLIC to BP_HIGH_DIASTOLIC)
-			diastolic_alert = BLOOD_PRESSURE_PRE_HIGH
-		if(BP_IDEAL_DIASTOLIC to BP_PRE_HIGH_DIASTOLIC)
+	var/blood_pressure_disatolic = bp_list[2]
+	if (blood_pressure_disatolic)
+		if(blood_pressure_disatolic >= (species.bp_base_disatolic - BP_DIS_IDEAL_MOD) && blood_pressure_disatolic <=  (species.bp_base_disatolic + HIGH_BP_MOD))
 			diastolic_alert = BLOOD_PRESSURE_IDEAL
-		if(-INFINITY to BP_IDEAL_DIASTOLIC)
+		else if (blood_pressure_disatolic >=  (species.bp_base_disatolic - BP_DIS_IDEAL_MOD))
 			diastolic_alert = BLOOD_PRESSURE_LOW
+		else if (blood_pressure_disatolic >= (species.bp_base_disatolic + PRE_HIGH_BP_MOD) && blood_pressure_disatolic <= (species.bp_base_disatolic + PRE_HIGH_BP_MOD))
+			diastolic_alert = BLOOD_PRESSURE_PRE_HIGH
+		else if (blood_pressure_disatolic >= (species.bp_base_disatolic + HIGH_BP_MOD))
+			diastolic_alert = BLOOD_PRESSURE_HIGH
 
 	if(systolic_alert == BLOOD_PRESSURE_HIGH || diastolic_alert == BLOOD_PRESSURE_HIGH)
 		return BLOOD_PRESSURE_HIGH
diff --git a/code/modules/mob/living/carbon/human/species/species.dm b/code/modules/mob/living/carbon/human/species/species.dm
index 7765684deb3..1637d78b6ea 100644
--- a/code/modules/mob/living/carbon/human/species/species.dm
+++ b/code/modules/mob/living/carbon/human/species/species.dm
@@ -191,6 +191,17 @@
 	var/sprint_cost_factor = 0.9  	// Multiplier on stamina cost for sprinting
 	var/exhaust_threshold = 50	  	// When stamina runs out, the mob takes oxyloss up til this value. Then collapses and drops to walk
 
+	// Pulse modifiers
+	var/low_pulse = 40
+	var/norm_pulse = 60
+	var/fast_pulse = 90
+	var/v_fast_pulse = 120
+	var/max_pulse = 160
+
+	// Blood pressure modifiers
+	var/bp_base_systolic = 120
+	var/bp_base_disatolic = 80
+
 	var/gluttonous = 0            // Can eat some mobs. Values can be GLUT_TINY, GLUT_SMALLER, GLUT_ANYTHING, GLUT_ITEM_TINY, GLUT_ITEM_NORMAL, GLUT_ITEM_ANYTHING, GLUT_PROJECTILE_VOMIT
 	var/stomach_capacity = 5      // How much stuff they can stick in their stomach
 	var/allowed_eat_types = TYPE_ORGANIC
diff --git a/code/modules/mob/living/carbon/human/species/station/skrell/skrell.dm b/code/modules/mob/living/carbon/human/species/station/skrell/skrell.dm
index 15ef62c2bd5..46d30093e80 100644
--- a/code/modules/mob/living/carbon/human/species/station/skrell/skrell.dm
+++ b/code/modules/mob/living/carbon/human/species/station/skrell/skrell.dm
@@ -70,6 +70,14 @@
 
 	stamina = 90
 	sprint_speed_factor = 1.25 //Evolved for rapid escapes from predators
+	bp_base_systolic = 100 // Default 120
+	bp_base_disatolic = 60 // Default 80
+	low_pulse = 30 // Default 40
+	norm_pulse = 50 // Default 60
+	fast_pulse = 70 // Default 90
+	v_fast_pulse = 90 // Default 120
+	max_pulse = 130 // Default 160
+	body_temperature = T0C + 27
 
 	default_h_style = "Skrell Short Tentacles"
 
diff --git a/code/modules/mob/living/carbon/human/species/station/tajara/tajara.dm b/code/modules/mob/living/carbon/human/species/station/tajara/tajara.dm
index f3e2414fb80..0ed4c48bce7 100644
--- a/code/modules/mob/living/carbon/human/species/station/tajara/tajara.dm
+++ b/code/modules/mob/living/carbon/human/species/station/tajara/tajara.dm
@@ -42,6 +42,13 @@
 	stamina_recovery = 4
 	sprint_speed_factor = 0.65
 	sprint_cost_factor = 0.75
+	bp_base_systolic = 140 // Default 120
+	bp_base_disatolic = 90 // Default 80
+	low_pulse = 50 // Default 40
+	norm_pulse = 70 // Default 60
+	fast_pulse = 100 // Default 90
+	v_fast_pulse = 130// Default 120
+	max_pulse = 170// Default 160
 
 	blurb = "The Tajaran race is a species of feline-like bipeds hailing from the planet of Adhomai in the S'rendarr \
 	system. They have been brought up into the space age by the Humans and Skrell, who alledgedly influenced their \
diff --git a/code/modules/mob/living/carbon/human/species/station/unathi/unathi.dm b/code/modules/mob/living/carbon/human/species/station/unathi/unathi.dm
index 4457d8fb77f..16d4247a6c4 100644
--- a/code/modules/mob/living/carbon/human/species/station/unathi/unathi.dm
+++ b/code/modules/mob/living/carbon/human/species/station/unathi/unathi.dm
@@ -41,6 +41,14 @@
 	sprint_cost_factor = 1.45
 	sprint_speed_factor = 3.2
 	exhaust_threshold = 65
+	bp_base_systolic = 80 // Default 120
+	bp_base_disatolic = 50 // Default 80
+	low_pulse = 20 // Default 40
+	norm_pulse = 40 // Default 60
+	fast_pulse = 60 // Default 90
+	v_fast_pulse = 80// Default 120
+	max_pulse = 100// Default 160
+	body_temperature = T0C + 24
 
 	rarity_value = 3
 	break_cuffs = TRUE
diff --git a/html/changelogs/BloodyDay.yml b/html/changelogs/BloodyDay.yml
new file mode 100644
index 00000000000..6e9d9e2d132
--- /dev/null
+++ b/html/changelogs/BloodyDay.yml
@@ -0,0 +1,6 @@
+author: TheGreyWolf
+
+delete-after: True
+
+changes:
+  - rscadd: "Blood pressure & pulse is now different for several species. The affected species are: Tajara, Unathi & Skrell. The latter two also now have a lower body temperature."