hi I am travelling overseas shortly.airlines have different requirements. i couldn't find any other threads on this topic
Singapore Air -"Generally, medical conditions don’t stop you from flying. However, cabin pressure can reach the atmospheric pressure at an altitude of 5,000 to 7,000 feet, so some medical conditions may require certain precautions".
British airways-
For some medical conditions you need to get medical clearance before you can fly, for example:
- recent illness, hospitalisation, injury or surgery
- existing unstable medical condition
- need for additional oxygen or use of medical equipment on board
- travelling for medical reasons or treatment.
With certain diseases (e.g. heart/lung disease, stroke, etc.), injuries as a result of an accident, or chronic conditions, an assessment of your fitness to fly must be obtained from Lufthansa’s medical service.
If you have any questions about your health on flights, please contact:
Lufthansa Medical Operation Centre
the last one is suggesting if you have a medical condition, that you need to get a clearence form, is this correct????