Male pattern baldness (Androgenetic Alopecia)
Female pattern hair loss (Androgenetic Alopecia)
Alopecia areata (spot baldness); Alopecia totalis or universalis
Traction alopecia
Trichotillomania
Trichorrhexis nodosa
Tinea capitis
Telogen effluvium (illness, pregnancy, weight loss)
Anagen effluvium (chemotherapy, radiation)
Medications (anticoagulants, anticonvulsants, hormones, anti-lipid agents, antihypertensives)
Iron deficiency anemia
Thyroid dysfunction
Malnutrition
Discoid lupus
Loose anagen syndrome
Primary cicatricial (scarring) alopecias
Understanding the Differential Diagnosis
Alopecia = baldness (hair loss)
Trichotillomania = [tricho- + Greek tillein, to pluck hair + -mania.] Tricho = hair.
Trichorrhexis = [tricho- + Greek. rhēxis, a breaking] = A condition in which the hairs tend to readily break or split.
“Trichorrhexis nodosa = a condition marked by fracture and splitting of the cortex of a hair into strands, giving the appearance of white nodes at which the hair is easily broken.”
Effluvium =
How Hair Grows.
Further Reading
Am Fam Physician. 2017 Sep 15;96(6):371-378. https://www.aafp.org/afp/2017/0915/p371.html
Am Fam Physician. 2009 Aug 15;80(4):356-362. https://www.aafp.org/afp/2009/0815/p356.html