Histamines are organic nitrogenous compounds that are released by the immune system during an allergic reaction. In medical terms, histamines can be referred to by different names such as nucleotides, biogenic amines, or immunoglobulins. Some synonyms for histamines may also include cytokines, leukotrienes, neuropeptides, and prostaglandins. The terms may be used interchangeably depending on the medical context. For instance, cytokines are commonly referred to as a group of immunoregulatory proteins that are responsible for triggering inflammation and mediating the immune response. A similar example is prostaglandins that play a crucial role in inflammation and the regulation of various physiological functions in the human body.