Foramen ovale is by far the most common congenital heart disease in adults. Most of them have no obvious symptoms and should be consulted when unexplained headache and dizziness with difficulty in breathing occur. The foramen ovale usually fuses around 2 months after birth, and if it fails to do so after 1 year of age, it is called patent foramen ovale. Clinically, most patients with patent foramen ovale do not experience shunting of the blood in the heart, and most have no obvious symptoms. It is only during strenuous exercise, coughing, and diving, which can increase the pressure in the patient’s right atrium, that shunting from the right to the left of the heart occurs, resulting in headache, dizziness, dyspnea, and limb weakness, etc. When unexplained headache, dizziness, and limb weakness occur, the patient may experience a shunting of the heart. When unexplained dizziness, headache and dyspnea occur, please go to the hospital promptly.