3 Answers

Understanding our Adrenaline system>>http://breakingmuscle.com/health-medicine/understanding-our-adrenal-system-epinephrine-adrenaline

Below is a list of symptoms if you have lack of adrenalin. I forgot to post the source…...

Symptoms
Insomnia and non refreshing sleep
Fatigue and a feeling of exhaustion
Lack of stress management
Cravings for salty and sweet food items
Extreme sensitivity to cold
Low stamina and low recovery from body exercises
Low immune response
Cognitive dysfunction and memory loss
Lack of concentration
Premenstrual syndrome
Trembling and palpitation under pressure
Reduced sex drive
Low blood pressure
Neck pain and back pain without any significant reason
Along with the above mentioned symptoms, nervousness, lack of energy and hypoglycemia and dyspepsia are the common symptoms. Some often neglected but severe symptoms of adrenal fatigueare are bronchitis, lasting cough, flu and cold, allergies, postural hypotension and severe headaches.

Read more at Buzzle: http://www.buzzle.com/articles/adrenal-fatigue-symptoms.html

Oh! The source is Buzzle

It makes you muscles weak.