གཏུམ་མོ
Inner Heat (Tummo)
拙火定 · Caṇḍālī / Chandali
Activity Siddhi 事業神通Tummo (Inner Heat, Caṇḍālī) is the ability to generate intense bodily warmth through meditation, defying ordinary physiological limits and enabling survival in extreme cold without ordinary insulation. The first of the Six Yogas of Naropa, Tummo is perhaps the most scientifically documented of all Tibetan siddhis: Harvard cardiologist Herbert Benson and his colleagues conducted controlled laboratory studies in 1981 demonstrating that practitioners could raise their peripheral body temperature by up to 17°C while sitting in near-freezing conditions, and dried wet sheets placed on their bodies in freezing temperatures steamed and dried within minutes. Milarepa's legendary survival in icy Himalayan caves wearing only a thin cotton robe for decades is understood as the classical demonstration of Tummo mastery. The inner heat is generated in the navel chakra and spreads through the body, with the byproduct of bliss used as fuel for the higher completion stage practices.
Tummo - Strengthening our Self Healing Power | Inner Fire School
🧘 Associated Practice
Six Yogas of Naropa (Tummo is the first and foundation yoga); specifically involves visualising the central channel and chakras, the 'short AH' at the navel, and the melting of the white drop at the crown
☸ Relationship to the Path
Tummo is the foundation of all Six Yogas practices because the inner heat it generates melts the ordinary conceptual rigidity and awakens the bliss-emptiness (bde stong) experience that is the actual vehicle of liberation in Highest Yoga Tantra. Without Tummo, the other five yogas cannot be properly practised.
📜 Classical Source
Six Yogas of Naropa; Hevajra Tantra (which describes Caṇḍālī); Herbert Benson et al. 'Self-reported perception of body heat' (1982, Nature); Milarepa's Hundred Thousand Songs
Associated Masters
⚖ Ethical Note
Tummo practice requires proper empowerment and instruction, as incorrect practice without proper foundation can cause physical harm. The tradition emphasises that the heat generated is a by-product of correct practice, not the goal itself—the goal is the bliss-emptiness experience that fuels higher practices.