01Pattern hair loss (male or female pattern)
Hair gradually becomes finer and shorter in a typical pattern: the temples and crown in men, a widening part in women. It is common and often runs in families.
How a doctor tellsThe doctor examines the scalp with a magnifying scope, looking for hairs of different thickness in the affected area.
02Shedding after stress, illness or diet change
Many hairs enter the resting phase at once and fall a few months after a trigger such as illness, childbirth, sudden weight loss or major stress.
How a doctor tellsA gentle pull test brings out several hairs, and the history points to a trigger two to four months earlier. Blood tests may be suggested.
03Patchy hair loss
Round, smooth bald patches can appear quickly. This is a different condition and needs a doctor’s treatment.
How a doctor tellsClearly defined patches with smooth skin, sometimes with short broken hairs at the edges.
04Traction and hair damage
Tight ponytails, extensions and frequent bleaching or heat can thin the hairline or break hair along its length.
How a doctor tellsThinning follows where the hair is pulled, and broken hairs of uneven length are seen.