Wellhealthorganic.com:11-health-benefits-and-side-effects-of-olives-benefits-of-olives

Olive is a species of tree. People make use of the oil from the seeds and fruit and water extracts from the fruit, and leaves to make medicines.

Olive oil can be used to help prevent stroke and heart attacks (cardiovascular disease) as well as breast cancer, colorectal cancer, arthritis rheumatoid and migraine headaches.

Many people make use of olive oil for constipation and high cholesterol, as well as the high pressure of blood vessels, issues that are caused by diabetes, as well as ear infections that cause pain as well as arthritis and gallbladder diseases. Olive oil can also be used to treat gastric jaundice, intestinal gas, as well as meteorism (swelling of abdomen caused by gas).

Many people also make use of olive oil to help boost the growth of bacteria in the gut, and as an “cleanser” or “purifier.”

Olive oil can be applied to the skin (used to treat the skin) to treat earwax, hearing ringing (tinnitus) and pain in the ear lice, cuts, small burns and psoriasis, stretch marks caused by pregnancy, and to protect the skin from UV (UV) damage caused by sun exposure.

In food preparation Olive oil is often used for cooking and salad oil.

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Health benefits and side effects of olives or (wellhealthorganic.com:11-health-benefits-and-side-effects-of-olives-benefits-of-olives)

Cancer of the breast. People who eat greater amounts of olive oil as part of their diets appear to be at a lower risk of getting breast cancer.
The heart disease. The replacement of saturated fats in the food with olive oil may lower the risk of stroke and heart disease, which includes reducing blood pressure and cholesterol. The addition of olive oil to your diet may help to prevent the possibility of having a heart attack in the first place. A study suggests that a high consumption of olive oil in the diet (54 grams a day, or about 4 tablespoons) reduces the chance of a heart attack in the first place by 82% compared to an intake of just seven grams olive oil or less each day. Averaging 1 liter per week of extra-virgin olive oil the Mediterranean diet for about five years may aid in preventing heart attacks and strokes for those over 55 with diabetes or an array of heart disease risk factors (smoking or high blood pressure and excessive LDL (“bad”) cholesterol and lower HDL (“good”) cholesterol and overweight, or an ancestor with a background of cardiovascular disease). A Mediterranean diet is one that has a high intake of nuts, fruits vegetables, cereals and vegetables and moderate consumption of poultry and fish, and a low consumption of milk products such as red meat processed meats, as well as sweets.The FDA now allows labels on olive oil as well as on foods that contain olive oil to say that a small amount, though not conclusive, evidence suggests that eating 23 grams per day (about two tablespoons) from olive oil in place of saturated fats could lower the risk of developing heart disease.
Colorectal cancer. Studies suggest that those who take in greater amounts of olive oil as part of their diets have less risk of getting colorectal cancer.
The high cholesterol. The use of olive oil in the diet in lieu of saturated fat will lower the levels of total cholesterol for those with high cholesterol. Some research suggests other oils in the diet, such as sunflower and the rapeseed (canola) could lower “bad” low-density lipoprotein (LDL) cholesterol as well as another form of cholesterol known as Apolipoprotein B more effectively that olive oil.
Blood pressure is high. By adding large amounts of olive oil extra virgin to your diet, and continuing with the standard treatments for high blood pressure may increase blood pressure over six months for people suffering from hypertension. In certain instances, those who have moderate to mild high blood pressure may be able to reduce their dosage of blood pressure medications or even quit taking the medication altogether. But, don’t alter your medication without the supervision of your doctor. The extract of olive leaves appears to reduce blood pressure for patients suffering from high blood pressure.
Earwax. Applying olive oil on the skin doesn’t appear to soften the earwax.
Ear problems. Applying olive oil on the skin doesn’t appear to ease pain in children suffering from ear infections.

The side effects of olive oil include:

The olive oil you use is likely to be safe when consumed with care through mouth or applied on the face. Olive oil is a good choice in a safe manner, as it makes up 14% of daily calories. It is approximately two tablespoons (28 grams) every day. A maximum of 1 liter per week of extra-virgin olive oil have been safely used as part of a Mediterranean diet for up to 5.8 years.

Olive oil consumed by mouth is well tolerated. If it is applied on the face, delay allergic reactions and contact dermatitis have also been observed.

There isn’t enough reliable information available on the safety of olive leaf however, to date, the olive leaf and pulp have not been linked to any significant adverse side effects in clinical research.

The pollen produced by olive trees may trigger a seasonal allergic reaction for some people.