Niacin deficiency is a condition where the body lacks the essential vitamin B3 required for optimal functioning. This deficiency can lead to a range of health complications, including fatigue, digestive issues, skin problems, and even mental disorders. There are different synonyms used for niacin deficiency, which include pellagra, vitamin B3 deficiency, and nicotinic acid deficiency. These terms are often used interchangeably to describe the same condition. Pellagra specifically refers to a severe form of niacin deficiency that was once common in European countries where corn was a staple food. Understanding these synonyms can help individuals identify and address symptoms associated with niacin deficiency before it becomes a more serious health concern.