Page "Pranayama" Paragraph 22

Many yoga teachers recommend that Prāṇāyāma techniques be practiced with care, and that advanced prāṇāyāma techniques should be practiced under the guidance of a teacher.

For example, people with high blood pressure must perform it cautiously or may even have to avoid it.

These cautions are also made in traditional Hindu literature.

Pregnant women may have to forgo pranayama.