If you are a male, you are likely to be suffering from androgenic alopecia
which is also called male pattern baldness
. However there are conditions like fungal infection
of the head which could cause hair loss too. Hair loss is not reversible if it is the male pattern baldness. Please don't waste your money on minoxidil or any "medicinal oils" out there. Only long term solution is hair restoration
which is implantation of hair. You can also wear a wig which is less expensive.