The duration of alopecia areata varies and depends greatly on the person affected. Even if one recovers from alopecia areata, there is a chance that it may come back again in the future. More »

According to WebMD, the medical reasons for alopecia, or hair loss, in children include tinea capitis, alopecea areata, trichotillomania, telogen effluvium, nutritional deficiency and endocrine problems. Non-medical caus... More » Health Conditions & Diseases

The duration of sunspots varies greatly as some of them only last hours, while others can last for many months. The longest-lasting known sunspot, which lasted 6 months, was recorded in 1943. Sunspots have an enormous va... More »

The duration of an adrenaline surge varies by the individual as well as the type of stress causing the alarm within the body, explains HowStuffWorks. If the adrenaline surge comes from seeing a cat stuck up in a tree, th... More »

Migraine length varies from person to person, but the majority of migraines last anywhere from four to 72 hours, according to Everyday Health. How long a migraine lasts depends on the type of migraine it is. Migraines la... More » Health Conditions & Diseases

Autism is developmental disability that varies greatly in its effects, but always interferes to some degree in a person's skills in communication and interaction, explains the Centers for Disease Control and Prevention. ... More » Health Conditions & Diseases

Heart palpitations can last for mere moments if brought on by an unexpected shock, or for indefinite lengths of time depending on the underlying causes or lifestyle habits of the person, explains University of Iowa Healt... More »