Internal tremors

It feels like a phone vibrating in your chest, or a low electric buzz down the spine, or a quiet trembling deep inside a muscle that isn't moving on the outside. Nothing shows on your hands. Nobody else can see it. It arrives most often at night, in the early morning, or after a stressful day. It's a real, documented midlife hormone pattern — not a fabrication, not early Parkinson's for most people.

Three overlapping mechanisms, all well described. And the medical look-alikes worth ruling out.

A wobblier autonomic nervous system. Estrogen modulates sympathetic tone. When it swings, the fight-or-flight system runs slightly hot at baseline, and small surges show up as a fine internal shake — especially first thing in the morning when cortisol spikes.

GABA withdrawal in the luteal week. Progesterone converts to allopregnanolone, a calming GABA-A modulator. When progesterone drops (late luteal, perimenopause), the nervous system rebounds and can fire more spontaneously — the same mechanism behind 3 a.m. wake-ups and jitters.

Sensory nerves firing more. Estrogen influences small-fibre nerve function. Buzzing, tingling, electric-shock sensations and internal tremors all cluster in the same peri window and often move around the body from week to week.

Look-alikes worth ruling out. Overactive thyroid, low B12, low magnesium, medication side-effects (SSRIs, stimulants, some inhalers), too much caffeine, and — rarely — early neurological conditions can all produce internal tremor. A basic workup (TSH, B12, magnesium, medication review) belongs in the first appointment.

Almost everything on this list is aimed at nervous-system regulation, because that's where the sensation lives.

Long exhales for two minutes. Breathe in for 4, out for 6 to 8. The vagus nerve fires on the exhale, and internal tremor usually softens inside 90 seconds. The physiological sigh (two short inhales, one long exhale) works even faster.

Cut the caffeine after midday. Caffeine amplifies exactly the pathway causing this. Most people who describe internal tremors are also mildly over-caffeinated. A two-week experiment (nothing after 11 a.m.) is a cheap, revealing test.

Magnesium glycinate before bed. 200 to 400 mg most nights is the range studied for neuromuscular calm and sleep — a research range, not a personal dose. It won't fix a big deficiency, but it's a low-risk first move for most people and many people feel the buzzing quiet inside a fortnight. Check with a doctor or pharmacist first if you have kidney disease.

Move the body earlier in the day. A brisk 20-minute walk in the morning burns off the sympathetic surge that shows up as internal shake by evening. Zone-2 (conversational-pace) cardio is the well-evidenced choice.

Have the MHT conversation. Micronised progesterone at night is the specific tool for the GABA-withdrawal mechanism above. Estrogen stabilises the wider autonomic picture. If tremors travel with sleep loss, palpitations and anxiety, raise all four in the same appointment.