* migraine attack or headache * excess estradiol and/or estrone * vitamin D deficiency * osteoporosis * emotional response, due to fear, embarrassment, grief * anorexia * anemia, due to blood loss, poor nutrition, or underlying disease such as sickle cell anemia * shock, a medical emergency caused by illness or injury * acute compartment syndrome * frostbite * common cold * cancer * hypoglycaemia *bradycardia * leukemia * panic attack * medications * ketorolac *amphetamines *ethanol *cannabis * lead poisoning * motion sickness * heart disease * Peripheral vascular disease * hypothyroidism * hypopituitarism * scurvy * tuberculosis * sleep deprivation * pheochromocytoma * squeamishness * visceral larva migrans * Orthostatic hypotension * methyldopa * loss of appetite * Space adaptation syndrome * fibromyalgia * Iron deficiency * Vitamin B12 deficiency * Buerger's disease *Hypovolemia
Pallor
Hypopigmentation
Snatiation
Hallucination
Sedation
Anhedonia
Psychomotor agitation
Apraxia