If your period is light, it's usually due to natural ... Heavier bleeding, bright red or dark blood, and blood accompanied by cramping or pain can indicate a problem and should be seen promptly.

The team observed that red light exposure is associated with less inflammation and activation of the immune system. For example, red light-exposed mice had fewer neutrophil extracellular traps ...

The century's longest 'blood moon', or lunar eclipse ... Earth's natural satellite turned a striking shade of red or ruddy brown. The "totality" period, where light from the Moon was totally ...