Not your usual tension headache. Not your typical migraine. A headache that hits suddenly and intensely—often described as the "worst headache of your life"—is a medical emergency until proven otherwise.
What it could mean: Subarachnoid hemorrhage (bleeding in the brain), meningitis, or aneurysm.
What to do: Seek emergency care immediately, especially if accompanied by confusion, stiff neck, vision changes, or difficulty speaking.
6. New or Changing Moles
Your skin keeps a record. When a mole changes—in size, shape, color—it's trying to tell you something.
The ABCDE rule:
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Asymmetry: One half doesn't match the other
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Border: Irregular, scalloped, or poorly defined edges
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Color: Varied shades of brown, black, tan, red, white, or blue
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Diameter: Larger than 6mm (about the size of a pencil eraser)
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Evolving: Changing in any way
What to do: See a dermatologist. Skin cancer is highly treatable when caught early.
7. Persistent Fever
A fever that comes and goes, or lingers for more than a few days, is your body signaling that something is wrong.
What it could mean: Hidden infection, inflammatory condition, or certain cancers (particularly lymphomas).
When to worry: Fever above 103°F (39.4°C), fever lasting more than three days, or fever accompanied by severe headache, rash, or stiff neck.
8. Unexplained Fatigue
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