Learn what different shades of blood mean and how they signal changes in your health or potential medical issues.

Blood tests can help a doctor diagnose a variety ... and overall metabolism. Abnormal levels of these hormones can indicate underactive thyroid (hypothyroidism) or overactive thyroid ...

A blood pressure (BP) reading consists of two numbers: systolic vs. diastolic pressure. Both numbers give important information about your health. However, your healthcare provider might give more ...