Male. Help! 4 months after bleaching, my hair is thinner than ever. Is it because of bleach or am I balding? (Photo)

If you are losing hair and would like a medical diagnosis, it would be best to see a doctor for an examination.Bleaching does not cause hair loss.

Bleach is very hard on the hair and scalp. If you noticed balding right after bleaching this may be a sign that your hair does not like the bleach and it is causing it to fall out. It is also possible that you are experiencing hair loss not caused by the bleach. Sometimes, if certain hairs were weak and programmed for falling out soon, things like harsh bleach can shock them and cause them to fall out. If this is the case, the hairs will most likely not return. While hair transplantation may be an option for you at some point, you should do your best now to maintain the hair you have now. You can do this by refraining from bleaching it, taking a hair loss medication, using minoxidil shampoo, buying a laser cap to promote hair growth, etc. This will allow you to maintain the health of your hair, ward off continued hair loss, and extend the time before you may need a hair transplantation.
You can also look into PRP treatments as they may be able to help with early hair loss.

Hair typically takes 90-120 days to cycle, so you may just now start to see some regrowth.  Using harsh chemicals can be traumatic to the hair follicles and cause the hair to fall out just like any other stressor.  However, if it is due to chemical stress, the hair loss is typically reversible. Whether or not you are also experiencing the beginning of male pattern baldness is difficult to determine at this time.  If you don't feel like you are improving, I would recommend seeing a hair restoration expert. Best of Luck