“Why is my crown thinning at 28 years old?”

Hello there! A common cause of hair thinning of the crown may be related to genetics, to hormones specifically the male hormones called androgens such as testosterone and dihydrotestosterone DHT resulting in ‘androgenic or androgenetic alopecia’, to inflammation and other causes. I recommend see a physician/dermatologist that can evaluate, and if needed, biopsy and diagnose this skin condition so appropriate treatment can be given!
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Having male pattern baldness at an early age is not unheard of.  You may want to see your primary care physician and see if there are any blood tests they may recommend.  There are treatments for this if no other medical cause is found.  Some can be fairly expensive.  

It sounds like you have a condition called androgenic alopecia, most common pattern of hair loss in males. It is a genetic condition when hair follicles (cells of hair root) are more susceptible to the effect of dihydrotestosterone (DHT), a chemical derived from testosterone. If you have inherited a susceptibility to the effects of testosterone, or higher activity of the enzyme that converts testosterone to the active dihydrotestosterone, and/or if you have higher level of testosterone, and/or if there is a local factor damaging hair (sweating, infection, mechanical irritation) then the result is hair thinning in what we call male baldness pattern i.e. on the crown (first) followed by receding hairline.
The damage from (long-standing) effect of DHT is irreversible i.e. once done hair will not regrow.
The best prevention of further hair loss and maybe some regrowth of hair is taking a medication that stops conversion of testosterone to DHT called finasteride taken as a pill daily. The other potential beneficial side effect of finasteride may be slowing prostate growth which is also dependent on high levels of testosterone or its conversion to DHT. Since sexual function depends on testosterone itself (and much less on DHT), the effects of finasteride on libido and erections are minimal to none in most men (but there are men who notice more pronounced or bothersome side effects).

Hi,

I am sorry you are experiencing this at a relatively young age. The most common cause of this is genetic, hereditary. Most likely your father or grandfathers also have this hair thinning.
Your mother may also have some thinning, but it is less prevalent in women, and manifests as crown thinning, but not usually baldness. This is not likely to be from an “illness”

Rogaine topically can help. It is a solution or foam to be applied to your scalp daily. It causes hair to be healthier, but is not a cure, so if you stop using it, the improvement disappears. There is a pill, finasteride, which blocks production of testosterone in the skin, but if you want to consider this, please see your doctor, or be referred to a dermatologist who specializes in hair problems.

I hope this has been helpful.

Cynthia Point, MD