Dizziness after sex is mainly considered to be related to over-excitement of the brain, insufficient blood supply to the brain, fluctuation of blood pressure and low blood sugar. 1. Over-excitement of the brain: When the brain is over-excited during sex, the inhibitory neurotransmitters are out of balance, which can lead to dizziness. 2. Insufficient blood supply to the brain: sympathetic nerves are too excited during sex, leading to vasoconstriction, and the blood is concentrated in the waist and legs, which further affects the blood supply to the brain, and dizziness may occur for a short period of time. 3. Blood pressure fluctuation: blood pressure fluctuation is obvious during sex, there may be a transient hypertension, and then the symptoms of dizziness. 4. Hypoglycemia: Sexual intercourse consumes a lot of energy, and if it is not replenished in a timely manner, hypoglycemia may be triggered, which may also give rise to the symptom of dizziness. If you have any of the above symptoms, or if you have any other symptoms at the same time, it is recommended that you consult a doctor in a timely manner to determine the cause of the problem and to provide targeted treatment.