As a pregnancy advances, the mother’s pelvis begins to tip backwards to balance the forward weight of the developing fetus with expansion of the uterus. The backward movement of the pubic and tailbones increases the arch in the lower back. These changes can put stress on the spine, enhancing its natural S shape, and can also strain other muscles and ligaments.

Animation produced by Visible Productions Inc.

J&J Vaccine and Blood Clots: What to Know If You Already Got the Shot

Six cases of cerebral venous sinus thrombosis have been reported among the 6.8 million people who received the J&J vaccine.

After the Johnson & Johnson vaccine was associated with cases of "rare and severe" blood clots, the U.S. government recommended officials pause giving the shot. But nearly 7 million people have already received the vaccine. So the news has a lot of people wondering if they should be concerned and what they need to look for.

The short answer: "Don't panic."

Keep Reading Show less