Reviewed by Dr. A M Thirugnanam, MD, MSICP, FSCAI, Ph.D. — Senior Interventional Cardiologist
Blood pressure is the most common reason Indians end up in a cardiac catheterisation laboratory, and it is also the most ignored. It produces no symptoms for years. By the time it causes a headache, it has usually already been damaging arteries, kidneys and the heart muscle for a decade. This guide explains what the two numbers mean, what yours should be, and how to measure them properly — because most home readings are taken wrongly.
What the two numbers actually mean
A reading of 130/85 has two parts. The upper number, systolic, is the pressure inside your arteries at the moment the heart squeezes. The lower number, diastolic, is the pressure that remains between beats, when the heart is refilling.
Think of your arteries as garden hosepipes. Systolic pressure is the surge when the tap is opened fully. Diastolic is the residual pressure in the hose when the tap is half closed. A hose can tolerate a surge occasionally. What destroys it is constant pressure, day after day, for years — and that is precisely what hypertension does to the delicate inner lining of your arteries.
Once that lining is injured, cholesterol particles enter the artery wall far more easily. This is why high blood pressure and high cholesterol together are so much more dangerous than either alone. They are not two separate problems; they are two halves of the same process.
What your numbers should be
- Normal: below 120/80
- Elevated: 120–129 systolic, with diastolic below 80
- Stage 1 hypertension: 130–139 / 80–89
- Stage 2 hypertension: 140/90 or above
- Hypertensive crisis: above 180/120 — seek medical care the same day
A single high reading does not make a diagnosis. Blood pressure varies through the day, rises with stress, and rises in a doctor’s clinic for a great many people. A diagnosis needs readings on at least two separate occasions, ideally supported by measurements taken at home.
Your personal target may be lower than the general one. If you have diabetes, chronic kidney disease, or established coronary artery disease, most cardiologists aim below 130/80. Ask your own doctor what number they are aiming for in your case — and if you have never been given a specific number, that is a reasonable thing to ask for.
How to measure it properly at home
Most home readings are wrong, and usually wrong in the same direction — falsely high. The technique matters as much as the machine.
- Sit quietly for five minutes before you measure. Not two minutes. Five.
- Sit with your back supported and both feet flat on the floor. Crossed legs raise the reading.
- Rest your arm on a table so the cuff sits level with your heart. An arm hanging by your side reads high; an arm held up reads low.
- Put the cuff on bare skin, not over a shirt sleeve.
- Do not talk during the measurement. Conversation adds several points.
- No coffee, tea, tobacco or exercise for thirty minutes beforehand.
- Empty your bladder first — a full bladder can add ten points.
- Take two readings a minute apart and record both.
Use an upper-arm monitor, not a wrist device. Wrist monitors are convenient and consistently less accurate. Take your machine to your next appointment and check it against the clinic reading once a year.
Measure twice daily for one week when you are first diagnosed or after any medication change — once in the morning before medication, once in the evening. Then a couple of days a month is enough. Daily lifelong monitoring rarely helps and often causes anxiety.
Why this matters more for Indians
Hypertension appears earlier in South Asians and is controlled less often. Salt intake in most Indian households is well above the recommended five grams a day — not mainly from the salt shaker, but from pickles, papad, packaged snacks, restaurant food and the generous salting of dal and sabzi.
There is also a particular pattern seen in Indian patients: blood pressure is diagnosed, treatment is started, the reading improves, and the medication is quietly stopped. Blood pressure is not an infection. Treating it does not cure it. Stopping medication because the number improved is like removing a splint because the bone stopped hurting.
What actually lowers it
These are ranked roughly by how much they move the number:
- Reduce salt. Cutting to under five grams daily can lower systolic pressure by five to six points. Start with pickles, papad, packaged namkeen and restaurant food rather than the cooking salt.
- Lose weight around the waist. Roughly one point of systolic pressure for every kilogram lost, for the first several kilograms.
- Walk briskly, thirty minutes, five days a week. Expect five to eight points.
- Increase potassium through fruit and vegetables — banana, coconut water, spinach, sweet potato — unless you have kidney disease, in which case ask your doctor first.
- Limit alcohol and treat sleep apnoea if you snore heavily and wake unrefreshed. Untreated sleep apnoea is a common reason blood pressure refuses to come down despite three medications.
- Sleep seven hours. Chronic short sleep raises pressure independently of everything else.
What to ask your doctor
- What is my target blood pressure, given my other risk factors?
- Have my kidneys and potassium been checked since starting treatment?
- Is there a reason for my hypertension that should be ruled out — thyroid, kidney artery narrowing, sleep apnoea — particularly if it began before I was forty or needs three or more drugs?
- Are any of my other medicines, including painkillers and nasal drops, raising my pressure?
- Can my regimen be simplified into a single combination tablet?
When to seek help urgently
Go to a hospital immediately, do not wait for an appointment, if a high reading comes with chest pain or pressure, severe breathlessness, sudden weakness or numbness on one side, difficulty speaking, sudden severe headache with vomiting, or visual disturbance. These suggest the pressure is already damaging the heart or brain.
Emergency: call 108 or go to the nearest hospital. Do not use this website.
This guide is educational and does not replace a consultation with your own doctor. Do not start, stop or change any medication based on what you read here.
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