Definition: Haematoloma is a type of cancer that occurs in blood cells, specifically red blood cells, which are responsible for carrying oxygen throughout the body. It can be caused by various factors such as exposure to chemicals, radiation, or genetic mutations. Symptoms may include fatigue, shortness of breath, and changes in appetite or weight. Treatment options vary depending on the cause, but often involve chemotherapy or other forms of treatment that aim to shrink or remove cancerous cells.