High or low histamine levels in the body can cause problems notes Joan Mathews Larson, PhD in this video clip.

Symptoms of High Histamine levels (causing brain to fire neurotransmitters too fast) include:

• Compulsive Drive (Type A)
• Impulsive• High libido (high sex drive)
• Cries easily, prolific tears
• Gets by on 5-7 hours sleep
• May get diagnosed as manic
• Their minds race
• Unable to focus
• Difficult to relax and go to sleep

Symptoms of Low Histamine include:

• Tires easily
• Loss of initiative, lackadaisical
• Low libido (sex drive)
• Irritable, tends towards high anxiety and panic
• Can stand a lot of pain
• Ears may ring
• Paranoid, may hear voices
• Food or chemical sensitivities
• Pear-shaped figure