The ventricular fossa generally refers to areas such as the back of the sternum and the anterior region of the heart. The pain on the left side of the fossa of the heart may be caused by costochondritis, gastric diseases, respiratory tract infections, insufficient blood supply to the heart and other diseases. 1. Costochondritis: Cold and trauma may lead to costochondritis, which may cause pain on the left side of the fossa of the heart. 2. Gastric diseases: gastric ulcer, gastritis and other gastric diseases may lead to stomach pain and symptoms of pain on the left side of the fossa of the heart. 3. Respiratory infections: Respiratory infections such as left-sided pneumonia and pleurisy may lead to edema and oozing, resulting in vague pain on the left side of the fossa. 4. Insufficient blood supply to the heart: atherosclerosis may lead to narrowing of the lumen of the artery, resulting in insufficient blood supply to the heart, inducing angina pectoris and symptoms of vague pain on the left side of the fossa of the heart. There are many other causes, such as neuropsychiatric factors can lead to the left side of the fossa of the heart hidden pain, such as longer duration, pain, or frequent episodes, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and targeted treatment or therapy.