Emotional Distress
A cancer diagnosis doesn't only affect your body---it can also affect your mind, spirit and emotional health. People with cancer can suffer from depression and anxiety, says the National Cancer Institute. The constant worry, fear and feelings of isolation and helplessness can interfere with a hearty appetite, causing loss of interest in food.
Treatment Side Effects
Common cancer treatments, like chemotherapy, can cause a number of side effects that can decrease appetite. Nausea, vomiting, fatigue and pain can all decrease appetite and are common with cancer treatments, says the American Society of Clinical Oncology. These treatments can also alter the senses of taste and smell, which can reduce appetite. Physical impairments, like dryness of the mouth, sores in the mouth, and problems with chewing and swallowing can also cause lack of appetite because it's so difficult to eat.
Changes in the Body
Cancer changes your body, and you just may not crave food as much. Your metabolism can change, says the ASCO, leading to a lack of appetite. Tumors and fluid that are in or near the stomach can also make you feel too full too early, so that you are unable to eat as much.
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