Cold flashes & chills

You're not always the one throwing off the blanket. Some people get the opposite: sudden waves of cold, a chill down the spine, teeth-chattering that arrives out of nowhere in a warm room. Cold flashes are a real, well-described vasomotor pattern — the same broken thermostat as hot flashes, running the other direction.

Same broken thermostat, opposite direction. And a couple of look-alikes worth ruling out.

The vasomotor rebound after a heat dump. After a hot flash, blood vessels that opened to release heat can over-correct and constrict too hard. That's the cold shudder that arrives 5 to 20 minutes after (or instead of) the sweat. Same neuroendocrine loop, different phase.

A narrower thermoneutral zone. Estrogen fluctuation shrinks the temperature window your body treats as 'fine'. Small shifts — walking from a warm room into air conditioning, finishing a hot cup of tea, the temperature drop before sleep — trigger a response that used to go unnoticed.

Thyroid slowing is a real look-alike. Feeling cold most of the time, with fatigue, dry skin, constipation, hair thinning and weight gain, points to hypothyroidism more than vasomotor. Perimenopause is when thyroid disease commonly shows up. TSH and free T4 are a reasonable blood test to ask for.

Iron deficiency and anaemia keep you cold. Heavy perimenopausal periods drain iron. Low ferritin narrows peripheral circulation, and you end up cold-handed and cold-footed even at rest. A ferritin (not just haemoglobin) test is worth asking for if periods have been heavy.

The tools are gentler versions of the hot-flash toolkit — same broken thermostat, softened.

Layer for the swing, not the average. A thin merino base layer, a cardigan, a scarf you can add or drop in 10 seconds. The goal isn't warmer clothes; it's clothes you can change fast when the shift arrives.

Warm the core, not the extremities. A hot drink, a warm bath, a hot-water bottle on the belly or chest resets the thermostat faster than socks or slippers alone. Once the core is warm, the hands and feet follow.

Move for two minutes. Walking up and down the hall, 20 bodyweight squats, a brisk stair climb — anything that pushes warm blood to the periphery breaks a cold flash inside a couple of minutes. Cheaper than another jumper.

Rule out the medical look-alikes before adjusting anything else. Ask for TSH, free T4, ferritin and a full iron panel. Cold intolerance that predates or outlasts other vasomotor symptoms is a thyroid conversation, not a menopause-only one.

MHT works on both directions. Estrogen therapy stabilises the hypothalamic thermostat as a whole — people on transdermal MHT usually notice hot flashes AND cold flashes soften together. Non-hormonal options (SSRIs, gabapentin, fezolinetant) also help both.