Most likely it is your lumbar vertebra.
Lumbar vertebrae
Twisted vertebrae cause back/neck pain. In some cases, if the twisted vertebrae is in the cervical spine, it can cause nerve damage. Twisted vertebrae can be fixed with chiropracty, or surgery.
A mass on the 4th and 5th vertebrae could cause compression of the spinal cord or nerves, leading to symptoms such as back pain, weakness, numbness, or tingling in the arms or legs. Treatment would involve addressing the underlying cause of the mass, which could include surgery, radiation therapy, or medication.
It is possible that you are changing your posture while doing your everyday routine to compensate for your back pains which could be affecting your legs. Try taking pain killers and resting for a while.
Not likely, but a twisted nerve in the neck might.
If you can see a swollen vertebrae in the small of your back through your skin then you probably have 1 of 2 conditions. You either have a herniated disk or a curved spine.
The upper back vertebrae are also known as the thoracic vertebrae.
aching back allergic reaction allergies cause person to not feel well
The lumbar vertebrae
The vertebrae located in the lower back are known as the lumbar vertebrae. They are the five largest and strongest vertebrae in the spinal column, situated below the thoracic vertebrae and above the sacrum. The lumbar vertebrae support the majority of the body's weight and are responsible for the flexibility and movement of the lower back.
the back bone is the vertebrae
Your back bone is also known as the spine which is made up of 33 vertebrae, the sacrum, intervertebral discs, and the coccyx. There are three sections of vertebrae known as the; the cervical vertebrae (neck), the thoracic vertebrae (middle back) and the lumbar vertebrae (lower back).