Tumors develop when cells in the body grow abnormally and uncontrollably. Genetics plays a major role, some hamster breeds are more prone. Age is another factor, with tumors appearing more often in older hamsters. Poor diet, obesity, or exposure to infections may also increase the risk. In some cases, trauma or chronic inflammation in one area of the body can trigger unusual cell growth.
The most obvious sign is a lump on or under the skin. These may start small but gradually increase in size. Some are soft and movable, while others feel hard.
Even if your hamster eats normally, tumors can interfere with how the body uses nutrients. You may notice your hamster looking thinner around the hips and back.
Hamsters with tumors often lose energy. They may stop running on the wheel, sleep more and appear less playful than usual.
Tumors pressing on nerves or organs cause discomfort. Your hamster may squeak, flinch or bite when picked up near the affected area.
Tumors that break through the skin may bleed, ooze or form scabs. These open wounds can become infected and cause bad odors.
Large tumors or internal growths may cause discomfort, making hamsters eat less or avoid hard foods. Appetite loss can lead to rapid decline.
Internal tumors, especially in organs like the stomach or liver, can make the belly look rounder or swollen. Sometimes the abdomen feels firm to the touch.
A hamster tumor is an abnormal lump or growth, which may be benign (non-cancerous) or malignant (cancerous).
Look for lumps under the skin, swelling, weight loss, or sudden changes in energy levels.
Quite common in older hamsters, especially females. Mammary and skin tumors are among the most frequently seen.
A balanced diet supports overall health, but tumors are often linked to genetics and age rather than diet alone.
Tumors may grow, bleed, become infected or press on vital organs, reducing your hamster’s quality of life.
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