Sleep
Learning Center
Monkeypox: What is it and how can it be prevented?
Find out more about the rare mpox, or monkeypox, viral infection, the possible symptoms in humans, treatment options and how to prevent getting or spreading the virus.
Melatonin side effects: What are the risks?
Melatonin is generally safe for short-term use but can cause side effects.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Macrocytosis: What causes it?
Enlarged red blood cells (macrocytosis) can be due to many factors.
Lung nodules: Can they be cancerous?
Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if you have a lung nodule.
Low blood sodium in older adults: A concern?
For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.
Loss of taste and smell: Natural with aging?
Aging can play a role in the loss of taste and smell — but not always.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
Isolated systolic hypertension: A health concern?
Both the top and bottom numbers in blood pressure readings hold clues about your health. But if just the top number is high, it might be a concern.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
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