We're all tired. But there's a difference between "I stayed up too late" tired and "I slept eight hours and still can't function" tired.
What it could mean: Anemia, thyroid disorders, depression, sleep apnea, chronic fatigue syndrome, or autoimmune diseases.
What to do: Track your fatigue—when it started, what makes it better or worse—and bring that information to your doctor.
9. Persistent Cough or Hoarseness
A cough that lingers for weeks deserves attention, especially if you're a smoker or former smoker.
What it could mean: Post-nasal drip, acid reflux, asthma, or—in some cases—lung cancer.
Red flags: Coughing up blood, unexplained hoarseness, chest pain, or unintentional weight loss.
10. Vision Changes
Sudden vision changes are always concerning. Gradual changes can also signal underlying problems.
What it could mean: Cataracts, glaucoma, diabetic retinopathy, macular degeneration, or—in sudden cases—stroke or retinal detachment.
Emergency signs: Sudden vision loss, double vision, or seeing flashes of light and floaters.
11. Difficulty Swallowing
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