If the oval foramen is not fully occluded, it usually does not improve the postoperative headache symptoms and may require reoperation. If the headache persists even after the foramen ovale is completely occluded, it is usually not related to the foramen ovale not being closed, but may be caused by infection, lack of blood supply to the brain, or neurogenic headache. Patients are advised to seek timely medical attention to clarify the cause and then undergo targeted treatment. I. Incomplete blockage of foramen ovale: Incomplete blockage of foramen ovale leads to a decrease in the oxygen content of arterial blood in the body circulation, a decrease in the amount of blood entering the lungs for gas exchange, and a decrease in the oxygen difference between arterial and venous blood, which can lead to cerebral hypoxia and cause headache. The cause of the headache can be clarified by X-ray examination, and the doctor will consider whether it is necessary to perform surgery again. 2. Complete blockage of the foramen ovale: 1. Infection: such as cold, due to the infection of pathogenic bacteria, serious intracranial infection can occur, which can directly lead to the increase of intracranial pressure and headache symptoms, and can be treated with drugs such as phenomethamine tablets and aminoglutethimide capsules as prescribed by the doctor; 2. Insufficient blood supply to the brain: when patients have diseases such as hyperlipidemia, which can increase the viscosity of the blood, the blood circulation in the brain is blocked, and there is insufficient blood supply to the brain. Insufficient blood supply will directly lead to brain hypoxia and headache symptoms. It can be treated with drugs such as atorvastatin calcium tablets under the guidance of doctors; 3. Neurological headache: such as excessive tension, etc., can lead to the patient’s head or neck muscles lasting contraction, resulting in a tight bundle, pressure or dull pain feeling in the head, which leads to headache symptoms. Usually no special treatment is needed, and the symptoms can be gradually relieved after the tension is relieved. If the pain is more intense, oral ibuprofen and other medications can be taken under the guidance of a doctor.