Kapalbhati is considered a safe and beneficial yoga practice when performed correctly and under the guidance of a qualified instructor. However, if not performed correctly or if done too aggressively, it can cause certain health issues such as headaches, dizziness, and abdominal discomfort. It is also not recommended for people with certain medical conditions such as high blood pressure, hernia, or heart disease. It's always advisable to consult with your doctor before starting any new exercise or yoga practice.