Shock and physical trauma are known triggers for hair loss [2]. While there have been reports of post-traumatic stress disorder leading to alopecia areata, this is more commonly associated with a temporary type of hair loss known as telogen effluvium, rather than alopecia areata [3-4].
Matt Lucas later found out — in adulthood — that his hair loss was less likely to have been triggered by shock than his overactive immune system.
Alopecia areata is an autoimmune condition in which white blood cells attack the hair follicles, causing them to shed their hair and preventing regrowth [4]. An overactive immune system — in Matt’s case, characterised by chronic eczema, asthma, and allergies — can lead to alopecia areata.