Cortisol levels have become one of the most talked-about numbers in health — usually blamed for stress, stubborn belly fat, and poor sleep. But what does cortisol actually do, what are healthy cortisol levels, and how do you know if yours are too high or too low? Let’s separate the science from the hype and…
High liver enzymes are one of the most common surprises on a routine blood test — and one of the most worrying-looking. The good news is that mildly raised levels are usually not an emergency, and the most frequent cause is very treatable. So what do high liver enzymes actually mean, what causes them, and…
Magnesium is one of the hardest-working minerals in your body, involved in hundreds of processes — yet a deficiency is common and surprisingly easy to miss. It can show up as muscle cramps, poor sleep, fatigue, or anxiety, and a routine blood test doesn’t always catch it. So what are the signs of magnesium deficiency,…
If your smartwatch or a fingertip device has ever flashed a number like “98%” at you, that’s your blood oxygen level — and it’s a quick window into how well your body is being supplied with oxygen. But what counts as a normal SpO2 reading, when is it too low, and how much should you…
Your blood sugar level is one of the most important — and most misunderstood — numbers in your health. Millions of people have prediabetes and don’t know it, because it usually causes no symptoms at all. So what is a normal blood sugar level, what does your HbA1c mean, and when do the numbers signal…
A cholesterol test gives you four numbers — and most people have no idea which ones they want high and which they want low. (Yes, one type is actually good for you.) So what is a healthy cholesterol level, what do LDL, HDL, and triglycerides mean, and when should your numbers worry you? Let’s decode…
Vitamin B12 deficiency is surprisingly common — and surprisingly easy to miss. Its symptoms creep in slowly and look like everyday tiredness, yet left untreated it can cause lasting nerve damage. So how do you know if you’re low, what’s a normal B12 level, and what should you do about it? Let’s decode it. What…
TSH is the single most common thyroid test — and one of the most confusing numbers in medicine. The biggest source of confusion? A high TSH usually means an underactive thyroid, not an overactive one. If that seems backwards, you’re not alone. Let’s decode what your TSH level really means. What is TSH? TSH stands…
Ferritin is one of the most useful — and most overlooked — numbers on a blood test. It’s essentially your body’s iron savings account, and when it runs low, you can feel exhausted long before a standard blood count shows anything wrong. So what does low ferritin mean, what are the symptoms, and what counts…
Vitamin D — the “sunshine vitamin” — is one of the most common deficiencies in the world, affecting an estimated one billion people. Yet its symptoms are so vague that most people never connect the dots. So how do you know if you’re low, what is an optimal vitamin D level, and how can you…