There are many reasons why a patient may experience pain when the knee is bent and when pressure is applied. It most commonly occurs in the patient’s knee joint due to long-term chronic exertion, strain, trauma, or an acute sprain of the knee joint. Damage to the meniscus, synovium, fat pad, ligaments and other tissues in the knee joint occurs as a result of trauma. When this occurs, an MRI of the knee joint can be taken to make a definitive diagnosis. The first step in treatment is conservative treatment, where the patient is instructed to reduce activity and keep the knee joint warm. At the same time, the knee joint can be treated with heat, physiotherapy, microwave therapy, low and medium frequency electrotherapy, or herbal fumigation. Next, sodium vitreous acid can be injected into the joint to nourish the cartilage and synovial membrane. In addition, the patient can be instructed to take non-steroidal anti-inflammatory and analgesic drugs, and can take oral celecoxib, which can relieve this pain phenomenon.