Tarry stools are feces that have dark red or dark black color. Black tarry stools can occur because of consuming certain foods and supplements or due to bleeding in your upper gastrointestinal (GI) tract. Your stools can appear dark green, black or discolored because of eating foods like licorice, green leafy vegetables, or when taking iron supplements. Black tarry stools that have a foul smell are often caused by internal bleeding in the upper part of your GI system (medical term is melena).

Probiotics are live bacteria and yeasts that can help treat constipation and improve your gut health. Certain strains of probiotics help you poop more frequently as they loosen and soften stool, help make it easier to pass stool, and improve your digestion. Taking probiotics for regular bowel movements can also help to relieve symptoms of constipation like bloating, hard stomach, and abdominal pain.

Sensitive pregnancy tests can give accurate test result in the very early stages of pregnancy. Many home pregnancy testing kits advertise a 99% accuracy when testing after the first day of a missed period. However, not all pregnancy tests are sensitive enough to provide accurate results as early as 3 or 4 days after implantation.  

Hemoglobin (Hgb or Hb) is a protein found in red blood cells which is required to transport oxygen throughout the body. Your blood needs hemoglobin levels to be in the normal range to provide oxygen to the cells in your body. Low hemoglobin levels result in various types of anemia which can cause symptoms like fatigue, dizziness, headaches, and shortness of breath. High levels of hemoglobin are less common and can also result in similar symptoms to low hemoglobin in the blood.

Passing dark urine that is dark yellow or dark brown could mean something as simple as being dehydrated, or it could be as serious as a problem with your liver. In other cases, dark colored urine that is brown, orange, tea colored or even black can be caused by certain foods, medications, a urinary tract infection, or other health issues. In most cases, there is nothing to worry about if you have noticed that your pee has turned a darker color.

Urinary tract infections (UTIs) happens when microbes or germs infect your bladder, kidneys, urethra, and other parts of your urinary system. UTIs usually cause a painful burning sensation when urinating and can affect both men and women. Depending on which part of your urinary system is affected, a UTI can cause fever, chills, abdominal pain, and abnormal discharge.

The chances of getting pregnant on your period are quite slim. However, you can still get pregnant from having sex on your period. Early ovulation, irregular menstrual cycle, or long sperm lifespan can increase your chances of pregnancy around your period. There is also a very small chance of getting pregnant right after your period if ovulation occurs much earlier than usual. But in most cases, there is a little chance of becoming pregnant right before your period.

Right-hand itching usually means that you have a skin allergy, irritation, dry skin, or have been under stress lately. In many cases, your right hand can itch like crazy if you have a chronic inflammatory skin condition like eczema, psoriasis, or a fungal infection.  Whatever the reason for your right-hand itching, you often have to deal with a mild to a strong urge to scratch your palms, back of your hand, or arm.

Tapeworm (also called cestode) is a type of parasite infecting humans and animals. Tapeworms are also referred to as flatworms and they live in the digestive and intestinal tract of humans and animals. The symptoms of a tapeworm infection in humans can include abdominal pain, diarrhea, fatigue or weight loss. In some cases, tapeworm infection (medical name taeniasis) can cause other symptoms such as headaches and itchy red rash. Sometimes, stool from a human affected by these parasitic worms will contain eggs and segments of tapeworm.