You rely on your feet to get around, wait in line, exercise, play sports, and even dance. But did you know that your feet can also be an early warning sign of a heart attack?

The feet can reveal subtle clues about cardiovascular health, and in some cases, warning signs can appear up to a month (or more) before a heart attack. These signs aren’t definitive, but they may indicate poor circulation or heart dysfunction that requires medical attention.

Here are some foot-related signs that may appear a month before a heart attack:

1. Cold feet or toes

Constantly cold feet, even in warm environments, can signal poor blood circulation.

A weakened heart may not pump blood efficiently to the extremities.

2. Swelling (edema) of the feet and ankles