Tracking and your doctor
Hot flash interference score
Count last week's night flashes by grade, rate what they did to your days, and leave with two numbers and one summary line for your appointment.
To tell how bad your hot flashes are, grade each one the way menopause studies do: mild means you felt hot but stayed dry, moderate means you sweated, and severe means the sweat stopped what you were doing. Count a week of night flashes in those three grades and you get a severity score from 1 to 3, the same calculation drug trials report. Add how often a flash woke you and how your days went, and you have a description of your week that a doctor can read in ten seconds.
"They're bad" is hard to act on in a ten-minute appointment. "Eighteen flashes in seven nights, four of them severe, woken on five nights and tired most days" is not. The form below turns your week into that sentence.
Score your last seven nights
Think back over the last seven nights, from going to bed to getting up. If you keep a night diary, copy the numbers from it. A box left empty counts as zero.
How the score is worked out
The three grades come from research diaries. A 2016 study that followed 647 women through midlife asked them to describe their hot flashes as mild (heat without sweating), moderate (heat with sweating) or severe (heat with sweating that disrupts usual activity), and trials of hot flash medicines grade every flash in the same three steps. At night your usual activity is sleep, so on this form a severe flash is one that got you out of bed or made you change.
The severity score is a weighted average. A mild flash is worth 1 point, a moderate one 2 and a severe one 3. Add up the points and divide by the number of flashes. A score of 1.0 means every flash was mild and 3.0 means every one was severe, and the number says nothing about how many there were. That is why the page shows the count next to it: twenty mild flashes and two severe ones are different weeks, and your doctor needs both numbers.
The nights you were woken and the five daytime lines are your own ratings, shown back to you as you gave them. The American College of Obstetricians and Gynecologists says night sweats can wake you and leave you tired the next day, and the NHS symptoms page lists changes in mood, anxiety and problems with memory or concentration among menopause symptoms. The page does not add these up into a grade, because there is no published cut-off for these five questions and inventing one would give you a label that means nothing.
The published interference scale
If you searched for the hot flash interference scale, you probably mean the Hot Flash Related Daily Interference Scale, which Janet Carpenter developed in 2001 for women after breast cancer. Menopause trials have used it since. It asks how much hot flashes interfered with ten parts of life over the past week, from work and sleep to mood, relationships and enjoyment of life, each rated from 0 to 10. A shorter version keeps only sleep, mood and concentration. In a 2017 analysis of 899 women in three trials, Carpenter's team put average item scores of 0 to 3.9 at mild interference, 4 to 6.9 at moderate and 7 to 10 at severe.
The questionnaire was published under copyright, so its questions are not reproduced here. If a clinic or a study hands it to you, those cut-offs apply to its own questions only. The score on this page measures something narrower: how many flashes you had and how hard they hit.
A worked example
Take a made-up reader with a rough week. She had 5 mild flashes, 9 moderate and 4 severe over seven nights, and a flash woke her on 5 of them. She felt moderately tired most days, a little foggy and a little on edge, and her mood and plans were fine.
Her severity points are 5 × 1 + 9 × 2 + 4 × 3 = 35, over 18 flashes, which gives 1.9. Her summary reads: 18 night flashes in 7 nights (5 mild, 9 moderate, 4 severe), severity score 1.9 out of 3, woken on 5 of 7 nights, next day tired (moderate), concentration (mild), anxious (mild). The "Fill in the example" button loads her week, if you want to see the result before entering your own.
Taking the number to your appointment
One week is a snapshot. Symptoms change from week to week, and the NHS notes they can shift over the years too, so I'd fill this in from a diary rather than from memory, and do it twice, a fortnight apart. Our printable night diary has a row for each flash with its grade, which makes the counts above a matter of adding up a column.
Print the summary or copy its last line into your phone. Then use the question list builder to decide what you want to ask, so the appointment covers your questions as well as your numbers. A score is also a way to judge a change you make at home: run it before and after the two-week trigger test and you can see whether dropping the evening wine moved anything.
My take
I'd start with the severe count and the nights woken, and I'd judge the week by those two before the average. A score of 2.5 from three flashes a week is a manageable week. Four severe flashes and five broken nights will wear you down whatever the average says, and I'd tell your doctor exactly that, in those words. Nobody needs a particular score before asking for help. If the nights are affecting your days, that is reason enough.
When it may not be menopause
Night sweats have other causes. The NHS night sweats page says to see a GP if they happen regularly, if you also have a high temperature, a cough or diarrhoea, or if you are losing weight without trying. Our warning-signs checker goes through those signs. Our article on whether hot flashes wake you or waking brings them explains why your count of night flashes may run higher or lower than what a sensor would record. More on keeping a record is in our tracking and your doctor section.