The most common cause of progressive hair thinning is androgenetic alopecia, also called male or female pattern hair loss. In genetically susceptible follicles, hormones such as dihydrotestosterone can shorten the active growth phase and gradually cause follicular miniaturization.
Other possible causes include iron deficiency, thyroid conditions, nutritional deficiencies, hormonal changes, stress, illness, certain medications, telogen effluvium and autoimmune conditions such as alopecia areata. Because different types of hair loss require different approaches, an assessment should be completed before beginning PRP or PRF treatment.