Severe loss of blood is the primary cause of hypovolemic shock.

Other indications (signs and symptoms) of hypovolemic shock include:

a. Restlessness and anxiety.

b. Weak and rapid (thready) pulse.

c. Cool, clammy (sweaty) skin.

d. Profuse sweating (diaphoresis)

e. Pale skin color and/or blotchy or bluish skin around the mouth.

NOTE: In casualties with dark skin, check the color of the mucous membranes on the inside of the mouth.

f. Shallow, labored, rapid, or irregular breathing or gasping for breath.

g. Dull eyes with dilated pupils.

h. Excessive thirst.

i. Nausea or vomiting.

j. Gradual and steady drop in blood pressure.

k. Mental confusion.

l. Loss of consciousness.