Early Warning Signs of Cancer You Shouldn’t Ignore

In the United States, each year it is estimated that more than two million people will be diagnosed with cancer, according to the National Cancer Institute. Cancer is the leading cause of death in the world, with 9.7 million cancer-related deaths, and new cases are expected to rise to almost 30 million by 2040. Prevention is key, but many people miss many early warning signs of cancer.

Many cancers, regardless of where they originate, often have non-specific symptoms, such as fatigue, that people ignore. 24/7 Tempo reviewed information from the Centers for Disease Control and Prevention and the American Cancer Society and spoke to several oncologists to determine the most common symptoms of the most common cancers in men and women, and the early warning signs of cancer you shouldn't ignore.

It's very important to remember that while all warning signs should be examined, most of the time they are caused by a condition other than cancer, Dr. Ronald Alvarez, chairman and clinical service chief of Obstetrics and Gynecology at Vanderbilt University Medical Center, explained.

"Cancer symptoms are vague, but they will almost never appear in isolation." They will be persistent, recurring, and will worsen over time, he added.

Some of the most common cancers include breast, prostate, lung, colon, and rectum, melanoma of the skin, bladder, and pancreatic. In the U.S., approximately 40.5% of men and women will develop some form of cancer during their lifetime. (Don't miss this article on the deadliest cancer in the U.S.)

• Commonly associated cancers: Ovarian, breast, pancreatic, colon, and stomach cancer

"Bloating is the most common very early sign of ovarian cancer," said Dr. Nicholas Tarricone, a gynecologist and the chair of the Department of Obstetrics and Gynecology at ProHEALTH Care in Rockville Centre, New York. "Even fatigue shows up later."

The bloating in the very early stages of the disease is actually gas building up in the abdomen as a result of the tumor growing and causing local inflammation. Bloating is also associated with cancers of the pancreas, colon, and stomach.

• Commonly associated cancers: Stomach, kidney, ovarian, pancreatic

Kidney cancers in their early stages are often found incidentally, said Dr. Amy Luckenbaugh, a urologic oncologist at Vanderbilt University Medical Center in Nashville, Tennessee. It usually happens when patients go to check out abdominal pain they may be feeling. Kidney lumps are hard to feel because the kidneys are located deep in the abdomen, but they may cause pain.

• Commonly associated cancers: Lung, larynx, upper respiratory tract

A dry persistent cough is usually a symptom of a respiratory tract infection. It may also be a sign of an allergy. However, a cough that lasts several weeks and only seems to be getting worse may be a sign of lung cancer, one of the most common cancers in both men and women, according to the CDC.

The cough may be caused by the tumor-stimulating receptors in the airways, or by the inflammatory response of the body, which also stimulates the airways. Lung cancer is associated with a build-up of fluid in the chest cavity, which can also cause a persistent cough.

Coughing up blood may also be a symptom of lung cancer and is not a good sign regardless of the underlying disease.

• Commonly associated cancers: Skin

Skin cancer is the most common type of cancer among both men and women, and moles are a good way of detecting it. Any changes in size, color, shape, or the surface of a mole, as well as the appearance of any new spots or new swelling beyond the borders of the mole, should be checked out. Most often, cancer detected through mole changes is at an earlier stage and is more easily treatable.

• Commonly associated cancers: Stomach, ovarian, pancreatic

What makes some cancers difficult to detect at an early stage is the fact that they don't often cause symptoms when they begin to form. An early signal of ovarian cancer, however, can be a sense of fullness after eating just a little bit, according to Alvarez, chairman and clinical service chief of Obstetrics and Gynecology at Vanderbilt University Medical Center.

Early satiety can also be a sign of stomach cancer. The tumor pushes on the intestine, which pushes the stomach resulting in less space for food.

• Commonly associated cancers: Colon, ovarian, endometrial

Abdominal discomfort such as cramping and gas pain may be a sign of colon cancer if it is persistent and gets worse over time. When these symptoms occur, the cancer is usually advanced.

Because most symptoms of colon cancer don't normally appear until the tumor has spread, and because more young people are diagnosed with the disease, the American Cancer Society recommends screening for colon cancer to start when people turn 45.

• Commonly associated cancers: Bladder, ovarian

Feeling pressure or pain in the bladder that isn't going away after a week or two is a more specific sign of ovarian cancer, Alvarez said. The pain is likely caused by the tumor or fluid in the abdomen that has built up because of the tumor. "When it's cancer, abdominal pain and pressure on the bladder tend to happen together," Alvarez said.

• Commonly associated cancers: Lung

Lung cancer is very common but it is rarely detected early. The symptoms are too vague. One symptom may be bronchitis or pneumonia that doesn't seem to go away, as the tumors in the lungs may block the airway, causing frequent infections.

• Commonly associated cancers: All cancers

Being tired and having low stamina is a symptom of many chronic conditions. Cancer-related fatigue won't be the only symptom of the condition, Alvarez explained. The feeling of exhaustion in cancer patients is different than feeling tired from not getting enough sleep or working too much.

People with cancer feel very weak or drained. Rest can help for a short time, but even light physical activity is exhausting, according to the American Cancer Society.

• Commonly associated cancers: Gynecologic cancer

Many women's first sign of uterine cancer, or at least the first symptom they actually notice, is abnormal vaginal bleeding. Regardless of whether it's just spotting, a watery and blood-streaked flow, or heavy bleeding, it should be investigated especially if it occurs during or after menopause, Alvarez said.

Irregular bleeding is also a common sign of cervical cancer, he added. It may occur between menstrual periods or after sex.

• Commonly associated cancers: Most cancers

Weight loss is a common symptom in many cancers, but it's more common in later stages, Alvarez said. Unintentional weight loss, especially if it occurs simultaneously with other possible symptoms, may specifically be a sign of uterine cancer, he noted. The body produces cytokines to fight the disease and they may lead to loss of muscle and decreased appetite.

• Commonly associated cancers: Breast cancer

It's important to know how the breasts normally feel and look because any changes in size or appearance — swelling, redness, lumps, or nodes — should be investigated, according to the American Cancer Society.

Breast pain — when a tumor pushes into a nearby healthy tissue — is not very common at the early stages of the disease, but it's one of the first signs in women with inflammatory breast cancer, a rare but rapidly developing type of cancer.

• Commonly associated cancers: Ovarian, colon, stomach

Constipation or diarrhea may also be a sign of colon cancer. After spreading to the colon or from the formation of ascites, ovarian cancers can cause narrowing of the bowel and lead to constipation. The fluid buildup may be putting pressure on the bowel, making it hard for stool to pass.

It is also possible for some women with ovarian cancer to suddenly develop severe constipation that alternates with diarrhea.

• Commonly associated cancers: Spinal, colon, ovarian, lung

Back pain tends to not appear in isolation from other symptoms when the cause is cancer, Alvarez said. "As a sole symptom, the reason for it is probably stress." Back pain may develop in women with ovarian cancer due to fluid buildup in the pelvic area, especially if the uterus is tipped backward, according to Tarricone.

As an early sign, back pain is common in spinal tumors. The pain may spread to other parts of the body and get worse at night. Although rare, back pain may be an indication of colon cancer and lower back pain of kidney cancer.

• Commonly associated cancers: Bladder, kidney, prostate

Blood in the urine, whether clearly visible or only visible under a microscope, may be an early sign of bladder cancer, Luckenbaugh explained. There may be blood even if the color of the urine appears normal. The blood may be present one day and then disappear, but if it's cancer, it'll reappear, according to the American Cancer Society. Kidney cancer may also cause blood in the urine.

• Commonly associated cancers: Gynecologic cancer, bladder cancer

Bladder cancer is one of the most common urological cancers, almost all of which are more common in men, Luckenbaugh explained. Pelvic pain may be a sign of bladder cancer when it's advanced. When the tumor is too big it may block the kidneys causing back pain, Luckenbaugh added. Pelvic pain may also be a sign of ovarian or cervical cancer.

• Commonly associated cancers: Bladder, prostate

The symptoms of prostate cancer, especially at an early stage, can be similar to symptoms common among many men as they age, including loss of bladder control, more frequent urges to go to the bathroom, and the inability to empty the bladder entirely (which may also be a sign of colon cancer).

Men with prostate cancer often experience difficulty urinating because the prostate may be pressuring the urethra. Most of the time, however, these symptoms are due to an infection, Luckenbaugh noted.

• Commonly associated cancers: Breast cancer

A change in the color of the skin of the breast, areola, or nipple may be an early sign of breast cancer. The color may change to pink, red, and even purple. It may look like bruising. Some people dismiss it, but it's a common symptom of inflammatory breast cancer.

• Commonly associated cancers: Lungs, larynx

Most of the time, hoarseness is caused by inflammation of the vocal cords brought on by an upper respiratory tract infection, and sometimes by using your voice — speaking, singing, yelling — too much. Persistent hoarseness, however, may be a sign of larynx or lung cancer, as well as of thyroid cancer.

• Commonly associated cancers: Breast cancer

A lump or a mass in the breast, even if it's too small to cause any changes, is one of the first signs of breast cancer. The lump can be painless, hard, uneven, soft, tender, or round. While many symptoms of cancer are vague and may be signs of any number of ailments, breast lumps are relatively reliable signs of a cancer diagnosis down the road.

In a 2020 study published in the Lancet examining almost 8,000 people with non-screen detected cancers, breast lump was the most common presenting symptom and was consistently associated with increased odds of advanced breast cancer.