There are many reasons for the whole body tightness and exertion when bending over and lowering the head, and the common ones are lumbar disc herniation, ankylosing spondylitis, muscle strain, and so on. 1. Lumbar disc herniation: Degeneration of lumbar discs, along with partial or total rupture of the annulus fibrosus, the nucleus pulposus protrudes to irritate or compress the nerve root and cauda equina. When bending over and lowering the head, the compression symptoms will be more obvious, which can lead to the whole body tightening and exertion. 2. Ankylosing spondylitis: it is a rheumatic immune disease, which can involve the sacroiliac joints, spine and peripheral joints, etc. With the progress of the disease, it develops from lumbar vertebrae to thoracic and cervical vertebrae, and the whole body can be tense and stiff when bending over and lowering the head. 3. Muscle strain: long-term stooping and low head work, resulting in muscle strain, can also cause the whole body tightness and exertion when stooping and low head. Bending low whole body tightness and exertion may have other reasons, such as long-term lack of exercise, etc., such as discomfort symptoms should be timely to the hospital, improve the examination to clarify the cause of the disease, standardized treatment.