Chills and shivering in menopause

Shivering is a heating response

Shivering is rapid involuntary muscle contraction, and its purpose is generating heat. The body does it when core temperature falls below the threshold it is defending.

In menopause that threshold sits inside a narrowed thermoneutral zone, so a smaller drop triggers it. After a hot flash, with skin vessels dilated and sweat evaporating, that drop is easy to reach.

So the sequence — heat, sweat, then shivering — is one regulatory event rather than two symptoms.

Telling it from the chills of infection

This matters because the words used are identical and the causes are not:

• Vasomotor chills: brief, usually minutes, often after a flash or sweat, no fever, no body aching, and you feel normal between episodes
• Infective chills: sustained, often with teeth chattering, accompanied by fever, generalised aching, headache and feeling unwell throughout
• Rigors, meaning violent uncontrollable shaking lasting many minutes, are never a vasomotor symptom and always need assessment

The night-time version

The most common presentation is waking drenched, then becoming cold enough to shiver as the sweat evaporates, then struggling to get warm again.

Practical measures that address the mechanism rather than the symptom: natural-fibre or moisture-wicking nightwear that does not hold sweat against the skin, layered bedding that can be adjusted rather than a single heavy duvet to be kicked off, a cool room rather than a warm one, and a spare set of nightwear within reach.

Changing out of damp nightwear is the single most effective step, because evaporative cooling from wet fabric is what drives the shivering phase.

What else to consider

• Infection of any kind, which needs its own assessment
• Underactive thyroid, causing persistent cold intolerance rather than episodes
• Anaemia from heavy perimenopausal bleeding
• Low blood sugar, which causes shakiness, sweating and a cold clammy feeling and is easily mistaken for a vasomotor event
• Anxiety and panic, which produce adrenaline-driven shivering and cold extremities
• Some medications, including certain antidepressants, which increase sweating and therefore the cooling that follows

When to see someone

Seek care for chills with fever, particularly with burning on passing urine, back pain, cough or breathlessness, which suggest infection needing treatment.

Seek urgent care for rigors, confusion, a rash that does not fade under pressure, or chills with severe pain anywhere. Book routinely for persistent cold intolerance and ask for thyroid function, full blood count and ferritin.