Conditions

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Male infertility is present in up to half of all infertile couples. Therefore, it is very important that the male partner be evaluated early, prior to any female treatment(s)...


Malignant brain tumors contain cancer cells and often have no clear borders. Unlike benign tumors, the malignant brain tumor cell structure is very different than that of normal brain cells...


Malignant tumors are cancerous and are the result of abnormal tissue growth in the body. Unlike benign (noncancerous) tumors, malignant tumors are made up of cells that multiply, become uncontrolled, then spread to surrounding parts of the body...


Mastoiditis is an infection of the back of the temporal bone felt behind and below the ear. Learn more at the New York Head and Neck Institute.


Meckel's diverticulum is a small pouch in the wall of the intestine, near the junction of the small and large intestines. The pouch is a remnant of tissue from the prenatal development of the digestive system...


Mediastinal disease refers to an unusual group of tumors that form in the area called the mediastinum, which separates the lungs in the middle of the thoracic cavity...


Mediastinal disease refers to an unusual group of tumors that form in the area called the mediastinum, which separates the lungs in the middle of the thoracic cavity. About half of mediastinal tumors cause no symptoms and are found on a chest X-ray or scans for another reason. Occasionally, they will cause symptoms of chest pain or shortness of breath.


Northwell Health takes the most advanced approach to treating medulloblastoma tumors at the renowned Brain Tumor Center, part of the Northwell Health Neuroscience Institute...


Melanoma is a disease of the skin in which cancer cells are found in the melanocytes, the cells that produce color in the skin or pigment known as melanin...


Memory disorders go beyond occasional forgetfulness, hindering one’s ability to make, retain, and retrieve memories. They can be the result of progressive neurological disease or sudden brain injury, and can range from mild to severe cognitive impairment...


A variety of illnesses are specific to men. Prostate problems, erectile/sexual dysfunction, depression and heart disease can all be interrelated. Typical concerns include: problems achieving and/or maintaining an erection sufficient for satisfactory sexual intercourse (ED); achieving an ejaculation too soon after penetration (premature ejaculation); lack or orgasm and/or ejaculation...


Meniere’s disease is a condition where an individual experiences attacks of dizziness, hearing loss and ringing in the ear. Learn more at the New York Head and Neck Institute.


A meningioma is a tumor that can form on the meninges or the membranes that cover your spinal cord and brain. They usually grow inward, putting pressure on the brain and spinal cord, and can also cause thickening of the skull by growing outward...


Meniscus tears are fairly common knee injuries affecting the rubbery, crescent-shaped discs that provide cushioning between the knee bones. The meniscus is an important component of the knee; it offers shock absorption and contributes to the stability of the knee...


Menopause is a normal condition that every woman experiences at some point in her life when her ovaries stop producing estrogen, a primary hormone. It often occurs 12 months after your last menstrual period and signifies the end of menstrual cycles...


Menorrhagia, the most common type of abnormal uterine bleeding, is associated with heavy and prolonged menstrual bleeding. With menorrhagia, every menstrual period involves extensive blood loss and cramping, resulting in the interruption of daily activity...


While some women experience no abnormalities during their monthly cycle, there are several menstrual disorders that can cause both physical and emotional pain...


There are three different forms of mercury that cause health problems: elemental mercury (also known as liquid mercury or quick silver), inorganic mercury salts and organic mercury...


Mesenteric artery ischemia is a type of peripheral vascular disease. Your mesenteric arteries are those that supply blood to your small and large intestines...


Mesothelioma is a rare form of lung cancer that usually arises in the tissue lining of the lungs, called the mesothelium. It usually starts in the lungs, but can also start in the abdomen or other organs...


Mesothelioma is a rare form of lung cancer that usually arises in the tissue lining of the lungs, called the mesothelium. It usually starts in the lungs, but can also start in the abdomen or other organs. Most people who develop mesothelioma have worked on jobs where they inhaled asbestos particles.


A metastatic brain tumor is a cancer within the brain, but one that originated in another part of the body and then spread to the brain. Sometimes this process results in a single tumor; in other cases metastasis can cause multiple tumors...


Metastatic disease of the musculoskeletal system is the result of the spread of cancer cells from another organ to the bone. While metastatic disease may result from any type of carcinoma, bone is among the most common sites for metastasis from carcinoma of the breast, prostate, lung, thyroid and kidney...


Methicillin-resistant Staphylococcus aureus (MRSA) is a type of Staph bacteria that is resistant to many antibiotics. There are two types of MRSA: Hospital-associated MRSA, which can cause infections in the bloodstream and at surgical sites and pneumonia Community-associated MRSA, which can cause skin or lung (less common) infections MRSA is often spread through direct contact with an infected wound...


Micropenis is defined as a normally structured penis that is below the normal size range for an infant. Normally, the length of a newborn boy's penis is between 2...


Migraines differ from the common headache in their level of reported severity and frequency, as well as their tendency to be accompanied by additional symptoms such as nausea, vomiting, and sensitivity to light...


If you’ve suffered a mild traumatic brain injury (TBI), you may have remained conscious, or you could have had a brief loss of consciousness for a few seconds or minutes...


Experiencing a miscarriage can be an extremely difficult time for you and your partner, especially if you are told your future pregnancies will be high-risk...


Mitral valve prolapse (MVP) is the most common heart valve abnormality. In this condition, enough blood does not flow through the mitral valve into the coronary artery. If the leaflets (valve flaps) do not close tightly, blood can leak back into the heart’s chambers (left atrium and left ventricle), in a condition known as mitral regurgitation.


Valvular heart disease occurs when the heart's valves that control blood flow do not work properly. Valvular conditions can be present at birth or can be acquired later in life, resulting in valvular regurgitation (also known as valve insufficiency).


Valvular stenosis occurs over time as the opening in a valve narrows due to a collection of calcium deposits. When that happens, the heart cannot pump as well.


We understand that molar pregnancy, an abnormality of the placenta that results in a nonviable pregnancy, is a condition that can be very stressful. Our compassionate experts work hard to explain this condition in full detail, while offering a customized treatment plan specific to your needs...


Mood disorders, sometimes called affective disorders, refer to a category of mental health problems that include all types of depression and bipolar disorder...


Morton’s neuroma is a build-up of benign (non-cancerous) tissue in the nerves running between the long bones of the foot. Morton’s neuroma occurs when two bones rub together and squeeze the nerve between them...


Motor neuron diseases (MNDs) are a group of five degenerative neurological disorders that diminish control of voluntary muscles, resulting in disability and eventual death: amyotrophic lateral sclerosis (ALS or Lou Gehrig’s disease), pseudobulbar palsy, progressive muscular atrophy (PMA), primary lateral sclerosis (PLS), and progressive bulbar palsy (PBP)...


Some people call it a cold sore, others a fever blister, but this annoying and often painful chronic condition is caused by the same virus: herpes simplex...


Movement disorders are caused by abnormalities of the nervous system resulting in impaired or uncontrolled mobility, but may also be the result of autoimmune disease, infection, trauma, or may be a side effect of a specific medication...


Moyamoya disease is a rare, progressive cerebrovascular condition caused by blocked arteries in an area of the brain called the basal ganglia, located at the base of the brain...


Mucosal melanoma (cancer of skin pigment cells or lining tissue of the nose and sinuses) of the nasal cavity represents only one to two percent of all melanomas, but is the most common site of occurrence outside of sun-exposed areas of the skin...


Multiple sclerosis (MS), also known as disseminated sclerosis or encephalomyelitis disseminate, is a degenerative nerve disease that causes the insulated covering (myelin) of brain and spinal cord nerve cells to deteriorate over time...


If you found out you are having twins, or possibly even more babies, you are certainly not alone. The incidence of multiple births has increased rapidly over the years through the popularity of treatments such as in-vitro fertilization (IVF) and women waiting to conceive at a later age in life...


Multiple myeloma is a blood disorder that starts in a type of white blood cells called plasma cells. It is the most common type of plasma cell cancer. Northwell Health takes a sophisticated approach to treating multiple myeloma and associated diseases, including monoclonal gammopathy of uncertain significance (MGUS), Amyloidosis and Waldenstrom's macroglobulinemia...


Multiple system atrophy (MSA) is a rare degenerative neurological disorder with onset in adulthood with rapid progression. Early symptoms are very similar to those of Parkinson’s disease such as a lack of coordination, lightheadedness upon standing, tremor, speech impairment, and decline in bladder control...


Muscle strains in the thigh are very common, especially for active people. Muscle strains can occur in many parts of the body but the hamstring and quadriceps muscles of the thigh are very common sites...


Muscular Dystrophy (MD) is a group of more than 30 neurodegenerative diseases which weaken and progressively impair the function of muscles, resulting in loss of muscle mass, and the permanent death of muscle cells and tissue...


Myasthenia gravis (MG) is an autoimmune disorder of the nerves and muscles of the body that causes progressive weakness and, often, drooping of the eyelids known as ocular myasthenia...


Myasthenia gravis (MG) is an autoimmune disorder of the nerves and muscles of the body that causes progressive weakness and, often, drooping of the eyelids known as ocular myasthenia.


A mycotic aneurysm is an infected aneurysm and is also called microbial arteritis based on the mushroom or fungus-like morphology. Mycotic aneurysms are generally caused by a bacterial infection (such as Staphylococcus aureus or Streptococcus viridans) within the wall of the artery...


Myelitis is inflammation or a rare infection of myelin (the insulating substance that covers nerve cells) in the spinal cord, which disrupts the communication between the brain and the rest of the body...


Myelodysplastic syndromes are a group of precancerous conditions that can eventually lead to a form of leukemia called acute myelogenous leukemia, the most common form of leukemia in adults...


Myeloproliferative disorders are a group of diseases that affect blood cell formation. In all forms of myeloproliferative disorders, a bone marrow problem leads to increased levels of blood cells circulating in the bloodstream...


Myoclonic seizures are brief, involuntary contractions of muscles or groups of muscles lasting less than one second. An episode can be isolated, or occur repeatedly within a short amount of time...


Myoclonus is characterized by brief twitches, spasms, or seizures of muscles that last a few seconds, either in an isolated incident, or repeatedly within a short amount of time...


Chronic muscle pain caused by myofascial pain syndrome can be both relentless and debilitating. The causes of myofascial pain syndrome center around points in your muscles called trigger points...


Myofascial pain affects skeletal muscles that connect muscles to bones and help you move. It also affects the tissue (called fascia) that surrounds the muscles...


Myopathy is a disease which causes muscle weakness, twitching, dysfunction, pain, stiffness, and/or deterioration. It can be classified as either neuromuscular or musculoskeletal, as well as be characteristic of both as in certain cases of myositis, muscular inflammation...


Myositis is a rare disease in which the immune system chronically inflames the body's own healthy muscle tissue. The muscles are progressively weakened by persistent inflammation...


A myxoma is a noncancerous, irregularly shaped tumor in the upper left or right side of the heart, usually on the atrial septum, the wall separating the two sides...