New evidence suggests vitamin D may enhance short-term outcomes in oral lichen planus. Learn more about its role as an ...

Chronic pain is defined as pain that persists beyond acute pain, typically over six months. It can be initiated with an injury or disease, but may persist after the triggering injury has healed.

Chronic obstructive pulmonary disease (COPD) is a disease of the respiratory tract that is characterized narrowing of the small airways and destruction of lung tissue. This leads to poor airflow, ...