Why is my hs-CRP high? Inflammation is the thread through every flag on your panel
Your hs-CRP came back at 3.4. The note next to it said borderline. Nobody called. Somewhere else in the same folder your ferritin is 14, your ALT has drifted up, and your LDL rose last year without a single change in what you eat. Four flags, four explanations, four different people reading them. I read the folder as one story, and hs-CRP is usually the line that holds the story together. It measures inflammation. Inflammation is the process that sits underneath most of the other numbers moving in your forties. If you fix the thing that is inflaming you, several flags tend to settle at once. If you chase each flag on its own, you will be busy for years.
What hs-CRP actually measures
C reactive protein is made by your liver when your immune system is active. The high sensitivity version of the test can read very small amounts, which is why it is used to look for low level, long running inflammation rather than an infection you can feel. The categories most labs and cardiology groups use are simple. Under 1 mg/L is low. Between 1 and 3 is average. Over 3 is high. Over 10 usually means something acute is going on, a cold, a dental abscess, a flare of something, and the test should be repeated in a couple of weeks before anyone reads meaning into it.
Here is the part your report does not say. The reference range on the page is often printed as 0 to 3, or even 0 to 5. So a 2.9 gets no flag at all, and a 3.4 gets the word borderline. Neither is a number I would leave alone in a woman in her forties, because the number itself is less interesting than what it points at.
Why inflammation rises in perimenopause
Estrogen was doing more than you were told. Estrogen has a calming effect on several parts of the immune system. As it becomes erratic and then falls, that brake comes off. The Study of Women's Health Across the Nation, which followed thousands of women through the transition, found that inflammatory markers shift across menopause and that body composition is the strongest single predictor of where a woman's CRP sits and where it goes.
Fat moved and became active. Visceral fat, the kind that packs around the organs rather than under the skin, increases through the transition even in women whose weight barely changes. Visceral fat releases inflammatory signals of its own. So a woman can weigh the same, have the same waist size on her jeans label, and carry a more inflammatory kind of fat than she did at 38.
Sleep and the nervous system. Broken sleep raises CRP. A nervous system that never stands down raises cortisol, and chronically raised cortisol, over time, stops doing its anti inflammatory job well. This is why I ask about sleep and stress before I ask about supplements. The most expensive thing you can do about inflammation is ignore the reason it started.
The gut. A gut lining that is more permeable than it should be lets bacterial fragments into the bloodstream, and the immune system responds. Bloating, reflux, and irregular bowels in the same folder as a raised hs-CRP are rarely a coincidence.
How it connects to the other flags
Cholesterol. LDL that rises with no dietary change is the pattern I wrote about in Issue 010. Inflamed arteries are the ones where that cholesterol causes trouble. hs-CRP is one of the markers that tells you whether your lipid change is happening in a calm body or an inflamed one. The two together matter more than either alone.
Ferritin. Inflammation pushes ferritin up, because ferritin is also an acute phase protein. A woman with true iron deficiency and inflammation can show a ferritin of 40 that would be 12 without the inflammation. This is why I never read ferritin without hs-CRP beside it. If hs-CRP is raised and ferritin is low anyway, the iron problem is worse than the number looks.
Liver enzymes. Fat in the liver and inflammation travel together. A rising ALT next to a raised hs-CRP and a rising fasting insulin is the metabolic triad I see most often in women in their forties who have not changed a thing about how they eat.
Insulin. Insulin resistance drives inflammation and inflammation worsens insulin resistance. It is a loop. Fasting insulin is the test that catches this early, and most panels still do not include it.
What I ask people to get
hs-CRP specifically. The standard CRP test is designed for infections and reads zero in most people. Ask for the high sensitivity version by name. If it comes back over 10, repeat it in two weeks before anyone reads it.
Ferritin alongside it. Iron studies read wrongly without an inflammation marker next to them.
Fasting insulin and fasting glucose together, plus HbA1c. Glucose alone misses years of the loop I described above.
A full thyroid panel. TSH, free T4, free T3, and thyroid antibodies. Autoimmune thyroid disease is an inflammatory condition and it is common in women in this decade.
ALT, AST and GGT. Read against the tighter upper limit the American College of Gastroenterology recommends for women, which is around 25 U/L for ALT. Many labs still print 40 or 50.
Vitamin D. Low vitamin D and raised CRP often sit together. Correcting one does not always fix the other, but it is worth knowing.
I do not order any of these. Your doctor does. I help you ask for them and I help you read the whole folder once they arrive.
What I would do first
Sleep before supplements. Seven hours, in the dark, with the last meal three hours before bed. This lowers CRP in a way no capsule matches, and it costs nothing.
Protein at breakfast and a walk after dinner. Both improve insulin sensitivity, which loosens the insulin and inflammation loop. The walk needs to be ten to fifteen minutes. It does not need to be impressive.
Look at the gut honestly. If you are bloated most days, treat that as data. It is a symptom with causes, and it can be worked up. A stool test or a referral to a gastroenterologist is a reasonable next step, and I will say so.
Alcohol, for six weeks, none. Six weeks tells you how much of your inflammation and your liver enzyme drift alcohol is responsible for. Most women are surprised in one direction or the other.
Ask about hormones. If hot flashes and night sweats are part of your picture, hormone therapy is the most effective treatment for them, and a menopause trained doctor is the right person for that conversation. Route matters here. Oral estrogen raises CRP as a side effect of passing through the liver, while transdermal estrogen does not appear to. That is a detail worth bringing to the appointment.
A note on caveats. If you are pregnant, on blood thinners, on thyroid medication, on diabetes medication, or have a history of disordered eating, do not change your diet or add supplements from an article. Bring the article to the person who prescribes for you.
When to push harder with your doctor
Push if your hs-CRP is over 3 on two tests taken at least two weeks apart and nobody has looked for a reason. Push if it is over 10 and no one has repeated it. Push if you have a raised hs-CRP next to joint pain, a rash, mouth ulcers, or a family history of autoimmune disease, because that picture deserves a rheumatology referral. Push if you have raised hs-CRP and a rising LDL and your doctor has said your ten year heart risk is low. Ask how that risk was calculated and whether inflammation was in the calculation. It usually was not.
You are allowed to ask for a plan. If the answer is that it is borderline and you should come back in a year, ask what would have to be true for it to stop being borderline. That question changes the conversation.
Questions I get asked
What is a normal hs-CRP for a woman in perimenopause?
The cardiology categories are under 1 mg/L low, 1 to 3 average, and over 3 high. There is no separate range for perimenopause. Many labs print an upper limit of 3 or 5, which means a value of 2.9 can pass with no flag. I treat anything over 1 as a reason to look at the rest of the folder more carefully.
Can perimenopause alone raise hs-CRP?
Falling estrogen removes some of the immune system's brakes, and visceral fat rises through the transition even at a stable weight. Both push CRP up. Research following women across the transition found that body composition is the strongest predictor of where CRP sits. So the answer is partly, and usually with help from sleep, stress, alcohol and the gut.
Does hs-CRP affect how I read my ferritin?
Yes. Ferritin rises with inflammation, so a raised hs-CRP can make a low iron store look normal. If your ferritin is low even with a raised hs-CRP, your iron picture is likely worse than the number suggests. Always read the two together.
Does hormone therapy raise CRP?
Oral estrogen raises CRP because it passes through the liver first. Transdermal estrogen, through a patch or gel, does not appear to have that effect. This is a question for a menopause trained doctor, who will weigh it with your history, and on its own it should not decide the question.
How fast can hs-CRP come down?
If the driver is acute, it drops within weeks once the infection or flare resolves. If the driver is sleep, alcohol, visceral fat or insulin resistance, most women see movement within eight to twelve weeks of consistent change. Retest at three months, and retest when you are not sick.
If you want it in order
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This is general wellness education and not medical advice, diagnosis or treatment. Talk to a qualified professional, especially if you are pregnant, nursing, taking medication or managing a condition.