How cancer disrupts the brain and triggers anxiety and insomnia

Scientists have discovered that breast cancer can quietly throw the brains internal clock off balance-almost immediately after cancer begins. In mice, tumors flattened the natural daily rhythm of stress hormones, disrupting the brain-body feedback loop that regulates stress, sleep, and immunity. Remarkably, when researchers restored the correct day-night rhythm in specific brain neurons, stress hormone cycles snapped back into place, immune cells flooded the tumors, and the cancers shrank-withou...