Monday, August 10, 2026

When to avoid scuba diving

 You should avoid scuba diving whenever a condition could make you lose consciousness, impair breathing or judgment, prevent safe equalization, or increase the risk of serious injury under pressure.




Common reasons to not dive include:

  • Cold, flu, sinus congestion, blocked nose or ear problems — you may not be able to equalize safely.

  • Fever, significant infection, vomiting or diarrhea — dehydration and reduced fitness increase risk.

  • Shortness of breath, chest pain, uncontrolled asthma, or a significant respiratory infection.

  • Uncontrolled high blood pressure or significant heart/circulation problems until medically cleared.

  • Recent surgery, hospitalization, or serious illness until a doctor familiar with diving clears you.

  • Pregnancy — recreational scuba diving is generally not recommended.

  • Alcohol or recreational drugs — don't dive while impaired or hungover.

  • Medication that causes sleepiness, dizziness, impaired judgment, or other significant side effects until its compatibility with diving has been assessed.

  • Extreme fatigue, dehydration, or feeling generally unwell.

  • Ear pain, difficulty equalizing, vertigo or hearing problems.

  • After a suspected decompression illness or lung over-expansion injury — stop diving and obtain medical assessment.

  • After flying: flying before diving generally isn't the concern; flying after diving requires an appropriate surface interval.

A useful rule for instructors and divers is: being physically capable of getting into the water isn't the same as being medically fit to dive. When there's uncertainty about a cardiovascular, neurological, pulmonary, or medication-related issue, a diving-medicine physician should make the call.

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