My Hamster Has a Lump on Its Neck – What Could It Be?

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A large neck lump on a hamster may be swelling from lymph-node hyperplasia, an allergic reaction to external-parasite bites, or a cyst formed after an injury. Take the hamster to a veterinary hospital for further examination, and decide on medication or surgery based on the results to avoid the condition worsening from delay.

Also, hamsters that eat high-calorie food long term easily develop internal heat, which can cause neck lumps. Do not overfeed high-calorie foods, as that harms the hamster’s health.

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