Classification
The International Association for the Study of Pain recommends using specific features to describe a patients pain:

region of the body involved (e.g. abdomen, lower limbs),
system whose dysfunction may be causing the pain (e.g., nervous, gastrointestinal),
duration and pattern of occurrence,
intensity, and
cause

Chronic versus acute
Pain is usually transitory, lasting only until the noxious stimulus is removed or the underlying damage or pathology has healed, but some painful conditions, such as rheumatoid arthritis, peripheral neuropathy, cancer and idiopathic pain, may persist for years. Pain that lasts a long time is called "chronic" or "persistent", and pain that resolves quickly is called "acute". Traditionally, the distinction between acute and chronic pain has relied upon an arbitrary interval of time between onset and resolution; the two most commonly used markers being 3 months and 6 months since the onset of pain, though some theorists and researchers have placed the transition from acute to chronic pain at 12 months. : 93  Others apply "acute" to pain that lasts less than 30 days, "chronic" to pain of more than six months duration, and "subacute" to pain that lasts from one to six months. A popular alternative definition of "chronic pain", involving no arbitrarily fixed duration, is "pain that extends beyond the expected period of healing". Chronic pain may be classified as "cancer-related" or "benign." Allodynia
Allodynia is pain experienced in response to a normally painless stimulus. It has no biological function and is classified by stimuli into dynamic mechanical, punctate and static.
As a result, new experimental drugs for small cell lung cancer are currently being tested, including Iadademstat (ORY-1001) and Keytruda (pembrolizumab). Additional images
Notable cases
Dustin Diamond, perhaps best known as an actor on Saved by the Bell. See also
Brown-Séquard syndrome
Cervical cancer


== References ==