Pain in the psoas muscle
The M. psoas forms together with the M. iliacus a functional unit, the M. iliopsoas. The function of the M. iliopsoas is the flexion of the hip, whereas the M. psoas is also responsible for the movement of the lumbar spine. If the muscle is overstressed, it can inflame itself or its tendon, or tension can develop.
If too little strain is placed on the muscle, it can lead to muscle shortening. Pain often occurs in the lumbar region and is usually clearly defined around the spine, but can also radiate to the thigh. Especially in the case of M. psoas, the pain increases when standing up or straightening up.
If an upright gait is no longer possible, this indicates tension or shortening of the muscle. Shortening often occurs during sedentary activities (truck drivers, computer work and generally desk work) because the muscle is constantly contracted in this position. If the muscle is stretched too quickly or incorrectly or too much, it can lead to muscle tension.
Painkillers or warming plasters can be used for a short period of time, but if the pain is permanent or has existed for several weeks, then a doctor should be consulted. Physiotherapy can lead to relief and exercise or back school can be very helpful to avoid wrong movements in the long term and prevent the associated pain. Pain of the M. psoas should not be confused with the “psoas sign”, which is caused by appendicitis.