Yes, cancer and its treatments can raise your blood pressure

Cancer itself and the drugs used to treat it are both known to increase blood pressure in some people. This happens through different pathways — cancer can trigger inflammation and hormone changes that affect your cardiovascular system, while certain chemotherapy drugs and targeted therapies directly stress the heart and blood vessels. If you have been diagnosed with cancer or are undergoing treatment, monitoring your blood pressure becomes part of your overall health picture, not just a side concern.

The connection matters because high blood pressure during cancer treatment can complicate your recovery and increase your risk of heart problems later. Understanding which cancers and treatments carry this risk, and what to watch for, helps you and your care team stay ahead of it.

Key Takeaways

  • Certain chemotherapy drugs — particularly those that target blood vessels or the immune system — are known to raise blood pressure as a side effect.
  • Some cancers themselves, especially those affecting the kidneys, adrenal glands, or hormone-producing organs, can cause high blood pressure through changes in hormone levels.
  • Blood pressure monitoring should happen regularly during cancer treatment, ideally at home between clinic visits, so changes are caught early.
  • Lifestyle changes like reducing salt, staying active when cleared by your doctor, and managing stress can help manage blood pressure alongside cancer treatment.
  • Tell your oncology team about any blood pressure medication you take, because some drugs interact with cancer treatments.

Which cancer treatments most often raise blood pressure

Certain classes of cancer drugs are more likely to cause high blood pressure than others. Angiogenesis inhibitors — drugs that block the formation of new blood vessels to starve tumors — are among the most common culprits. These include bevacizumab (Avastin), sunitinib (Sutent), and sorafenib (Nexavar). They work by interfering with blood vessel growth, but this same mechanism can stiffen existing blood vessels and raise pressure.

Tyrosine kinase inhibitors (TKIs) like imatinib (Gleevec) and dasatinib (Sprycel) also frequently raise blood pressure, as do some immunotherapy drugs such as checkpoint inhibitors. The reason varies by drug class, but the effect is real enough that your oncology team will likely check your blood pressure before starting these treatments and regularly during them.

Traditional chemotherapy drugs like cisplatin can raise blood pressure too, though the effect is often temporary. Corticosteroids sometimes given alongside chemotherapy to manage side effects can also contribute to higher readings. If you are taking any of these drugs, baseline blood pressure measurement before treatment starts gives your team a reference point to spot changes.

Cancers that can cause high blood pressure on their own

Some cancers raise blood pressure because of where they grow or what they produce. Kidney cancer is a classic example — the kidneys regulate blood pressure through fluid and salt balance, so a tumor there can disrupt that system. Adrenal gland tumors, whether cancerous or not, can release excess hormones like adrenaline and aldosterone, both of which raise blood pressure significantly.

Pheochromocytoma — a rare tumor of the adrenal gland — causes sudden, severe blood pressure spikes along with sweating, headache, and heart palpitations. If you experience these symptoms during or after a cancer diagnosis, mention them to your doctor right away. Thyroid cancer and some lung cancers can also affect blood pressure through hormone changes or by pressing on blood vessels.

The blood pressure usually improves once the cancer is treated, though it may take weeks or months for hormone levels to normalize. This is one reason why blood pressure monitoring continues well after active treatment ends.

How to monitor your blood pressure during cancer treatment

Regular monitoring is the first step in catching high blood pressure early. Your oncology clinic will check your blood pressure at each visit, but that snapshot once every few weeks may miss patterns. Home blood pressure monitoring — using a cuff at home on the same arm and time of day — gives a more complete picture and often catches rises that clinic visits alone would miss.

You can buy a reliable automatic blood pressure monitor at any pharmacy for $30 to $60. Sit with your back supported, feet flat on the floor, and your arm at heart level. Take readings at the same time each day, ideally in the morning before medication. Write down the numbers or use an app to track them, and bring the log to your oncology appointments. If readings stay above 140/90 or if you notice a sudden jump, contact your oncology team or primary care doctor — do not wait for your next scheduled visit.

Some people find that blood pressure rises during treatment weeks and falls during recovery weeks, so patterns matter as much as individual numbers. Your team may adjust your blood pressure medication, your cancer treatment schedule, or both based on what the data shows.

Managing blood pressure while undergoing cancer treatment

Blood pressure management during cancer treatment requires coordination between your oncology team and your primary care doctor or cardiologist. If you already take blood pressure medication, tell your oncology team the name and dose — some blood pressure drugs interact with cancer treatments, and your team may need to adjust timing or choice of medication.

Lifestyle changes work alongside medication. Reducing salt intake helps lower blood pressure for many people and is safe during cancer treatment. Aim for less than 2,300 mg of sodium per day by limiting processed foods, canned soups, and restaurant meals. Staying physically active — even gentle walking — lowers blood pressure, but always check with your oncology team first about what is safe during your specific treatment. Some treatments cause fatigue or heart stress that limits activity; your doctor can advise what is appropriate.

Stress management matters too. Cancer treatment is stressful, and stress raises blood pressure. Meditation, deep breathing, gentle yoga (if cleared by your team), or straightforward spending time outdoors can help. Some cancer centers offer counseling or support groups specifically for managing the emotional side of treatment, which indirectly supports your blood pressure as well.

Limiting caffeine and alcohol may also help, though this varies by person. Ask your oncology team whether these changes are relevant to your situation and your specific treatments.

What happens to blood pressure after cancer treatment ends

For many people, blood pressure improves once cancer treatment ends, especially if the high blood pressure was caused by the drugs themselves. However, the improvement is not always when ready — it can take weeks or months for your body to clear the medication and for blood vessels to recover. Some people find their blood pressure stays elevated even after treatment, either because the cancer itself caused lasting changes or because they developed high blood pressure as a separate condition during treatment.

This is why blood pressure monitoring should continue after active treatment. Your oncology team or primary care doctor will advise how often to check and whether to continue blood pressure medication. If you were on medication during treatment, do not stop it on your own — work with your doctor to adjust or discontinue it safely. Stopping suddenly can cause a dangerous spike in blood pressure.

Long-term heart health is part of cancer survivorship. Some cancer survivors develop heart problems years after treatment ends, so maintaining a healthy blood pressure through diet, activity, and medication (if needed) is an investment in your future health.

Frequently Asked Questions

Can high blood pressure during cancer treatment mean the cancer is getting worse?

Not necessarily. High blood pressure during cancer treatment is usually a side effect of the drugs or a response to the cancer itself, not a sign that treatment is failing. However, a sudden or significant rise in blood pressure should be reported to your oncology team, who can determine whether it is a medication side effect, a sign that your treatment plan needs adjustment, or something else entirely.

If I have high blood pressure before cancer treatment starts, will treatment make it worse?

It may, depending on which drugs you receive. If you already have high blood pressure, tell your oncology team before treatment begins so they can monitor you closely and adjust your blood pressure medication if needed. Some people's blood pressure stays stable; others see it rise. Baseline measurement helps your team spot changes early.

What blood pressure number should I be concerned about during cancer treatment?

Generally, readings above 140/90 warrant a call to your doctor, and readings above 180/120 are considered urgent. However, your oncology team may set different targets based on your age, other health conditions, and the specific treatment you are receiving. Ask your doctor what numbers should prompt you to reach out.

Can I stop taking blood pressure medication once my cancer treatment is done?

Do not stop on your own. Work with your doctor to decide whether to continue, adjust, or discontinue blood pressure medication after treatment ends. Some people need it long-term; others can stop safely once their blood pressure normalizes. Stopping suddenly can be dangerous, so any changes should be made under medical supervision.

Does exercise help lower blood pressure during cancer treatment?

Yes, but only if your oncology team clears it. Some cancer treatments cause fatigue, heart stress, or other side effects that limit safe activity. Ask your doctor what type and amount of exercise is appropriate for your situation. Even gentle walking, if approved, can help manage blood pressure and improve overall well-being during treatment.