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Frequent masturbation and ejaculation stimulate acetylcholine/parasympathetic nervous functions. Excessive stimulation can result in over production of sex hormones and neurotransmitters such as acetylcholine, dopamine and serotonin. Abundant and unusually large amount of these hormones and neurotransmitters can cause the brain and adrenal glands to perform excessive dopamine-norepinephrine-epinephrine conversion and turn the brain and body functions [...]

Perhaps this is something that many people have experienced it. The feeling isn’t comfortable and sometimes it last for a long period. Usually the headache after masturbation occurs when man ejaculates a couple of times per day in a short period of time. This happens because the brain is much  more sensitive to depleted blood flow [...]