Causes of pain at the Blood Sea point include joint pain, muscle pain, and skin injury. 1. Joint pain: the Sea of Blood is located on the medial side of the quadriceps muscle and is closely related to the knee joint. If there is trauma to the knee joint, or diseases such as osteoarthritis of the knee joint, it can lead to a higher sensitivity of the Blood Sea. At this time, the location of the Sea of Blood can be painful, and can also be accompanied by a feeling of soreness and swelling. 2. Muscle pain: the blood sea point belongs to the quadriceps muscle, so muscle pain will also affect the blood sea point and the emergence of soreness, pain, such as running after the quadriceps muscle soreness, at this time, the blood sea point will also appear obvious pressure pain. To summarize, the blood sea point pain daily should pay attention to avoid excessive exercise, such as walking for a long time, standing or strenuous exercise. If there is a knee joint disease that causes blood sea pain, you should consult a doctor in time to get a clear diagnosis and follow the doctor’s instructions for treatment.