Packing for a trip to Walt Disney World in December or January means being prepared for anything. Check the extended forecast before you leave. Bring along a sweatshirt or light jacket, and dress in layers that you can remove as the temperature warms up through the day.
Injury of a Muscle or Tendon. A damaged tendon or muscle can be the main culprit behind the swollen bump on the back of the neck. Muscles and tendons keep the body in shape and when one is injured or pulled, the muscle moves from its original position. The damaged part of the muscle sticks out, which forms the lump.
There are many causes of lumps in the neck. The most common lumps or swellings are enlarged lymph nodes. These can be caused by bacterial or viral infections, cancer (malignancy), or other rare causes. Swollen salivary glands under the jaw may be caused by infection or cancer. Lumps in the muscles of the neck are caused by injury or torticollis. These lumps are often at the front of the neck. Lumps in the skin or just below the skin are often caused by cysts, such as sebaceous cysts. The thyroid gland may also produce swelling or one or more lumps. This can be due to thyroid disease or cancer. Most cancers of the thyroid gland grow very slowly.