Health check and requirement:

If you have or had any medical issues stated below, we would require you to obtain a valid doctors certificate stating that diving activity is permitted. Without this certificate, we can not accept your diving request.        

Condition:
1)Heart trouble
2)High/Low blood pressure
3)Angina pectoris
4)Diabetes mellitus
5)Cardiovascular and respiratory diseases
6)Bronchial asthma
7)Pulmonary tuberculosis
8)Spontaneous pneumothorax
9)Pneumonia
10)Infectious disease
11)Pregnancy
12)Pleurisy
13)Alcoholism
14)Epilepsy
15)Dizziness disorder
16) Decompression sickness

【Note from NPO】
Diving in Japan, like other diving service around the globe, require you to fill out a "Medical form" before diving. Refusing to do this, you may not be allowed to dive due to safety precautions.
NPO Japan Diving Experience advises you to proactively fill out the form linked from below.
It is a Medical Statement provided by The World Recreational Scuba Training Council (WRSTC).

Link to RSTC Medical form

http://wrstc.com/downloads/10%20-%20Medical%20Guidelines.pdf