Pulmonary doctor warns 'cracking knuckles and joints' sign of major deficiency A doctor has warned that you may need to visit your GP if you experience cracking of your knuckles or joints.
According to experts at the BBC, they further explain: "Synovial joints (freely movable joints) have synovial fluid in the joint cavity that lubricates or 'oils' the joint so it moves smoothly.
She explains: "When one is low in vitamin D deficiency, this can cause many problems and one of them is associated with cracking your knuckles or your joints.
Dr Neena Chandrasekaran, a specialist in pulmonary and critical care medicine, under the username @neenziemd, shared on TikTok: "Cracking your knuckles or your joints is thought to be a release of air usually between the joints.".
"In synovial joints, the ends of the bones are covered with cartilage (called articular cartilage) which cushions the joint and prevents friction and wear and tear between the bone ends.
