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How are temperature sensations connected to pain sensations in the brain?

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thermoreception in polar bears — Thermoreception Warm-blooded animals, such as polar bears, maintain stable body temperatures and adapt to substantial geographic and seasonal temperature fluctuations. Thermal adaptation is supported by the function of sensory structures called thermoreceptors.

Temperature and pain sensations are closely linked in the brain through shared neural pathways and central integration mechanisms.

Neural Pathways and Integration

Thermoreceptive information and pain signals are processed through the lateral spinothalamic tract, a pathway that carries both temperature and pain sensations to the thalamus and eventually the cerebral cortex. Because these sensations share this tract, surgical procedures that interrupt it to alleviate chronic pain often result in the loss of temperature sensation as well.1

Central Mechanisms

The brain utilizes central neural mechanisms to modulate these sensations. For example, the thermal grill illusion demonstrates that the brain can inhibit pain through thermoreceptive activity. When cold and warm stimuli are applied simultaneously, the brain sums these inputs to reduce normal thermoreceptive activity, which "unmasks" or disinhibits cold-evoked C-fibre nociceptive activity, creating a burning sensation.2

Molecular and Cellular Links

At the cellular level, transient receptor potential (TRP) channels serve as a bridge between these senses. While some TRP channels are specialized for temperature, others—such as certain TRPV channels—respond to both warmth and noxious heat, functioning as both thermoreceptors and nociceptors.34