The reasons why a rabbit has a big bulge under its throat:

1. Getting angry. It is more common when the weather is relatively dry, the rabbit's diet is unreasonable, the water intake is low, and it is accompanied by symptoms of dry feces.

2. Inflammation. It is more common in rabbits with colds and respiratory infections. At the same time, they may suffer from loss of appetite, lack of energy, cough and fever.

3. Tumor. It may be a thyroid tumor. This kind of mass has a hard texture and is not free.

4. Bacterial infection. It may be that the injury was not treated, resulting in bacterial infection and the formation of cysts. In this case, there is no need to deliberately care about it. If there is pus, the pus needs to be drained, and then flushed with metronidazole and applied.

5. Rabbit scratching. It may be formed after being bitten by a parasite or scratched by a rabbit. You can apply some anti-inflammatory and antibacterial medicine.

6. Swollen lymph nodes. Mainly just do systemic anti-inflammation.

7. The bulge under the rabbit's neck is because it is a meat ball, which is generally a symbol of an adult female rabbit. A very small number of obese male rabbits will also have meat balls, which is a normal phenomenon.

Solutions to the big bulge under the rabbit's throat:

1. If the bulge under the throat is caused by internal heat, you can give the rabbit more water to drink and feed it. Some light and easy-to-digest diet will provide relief.

2. If the lump in the throat is caused by inflammation, you need to take anti-inflammatory drugs containing amoxicillin and clavulanate potassium.

3. Take the rabbit to the pet hospital for a B-ultrasound. If it is really a tumor, you should choose surgical resection or conservative treatment according to the actual situation.