How long do tides usually last?

What are early symptoms of Mallory-Weiss syndrome? Low t-cell count but not hiv? Could you be pregnant if you had intercourse 2 weeks before but had a regular period with no spotting? How did people brush there teeth in the olden days? Why do you test for leukocyte esterase? What is symbol for liver enzymes on blood test? 21 day detox and side-effects? What causes Fibroids to occur? How long does it take to recover from an laparoscopic appendectomy? How does the skin react to the environment? Why can people with food allergies suffer from malnutrition? Is 48 too high for a four month old baby's respiratory rate? What would cause bloating constant tiredness raised temperature a runny nose and problems sleeping in my 37 year old wife? How many people contracted the black death? When will you get your peried? Does madre de cacao can heal wounds? Can a premature baby breath on its own by 17 weeks? Do deaf schizophrenic people hear voices? Scientific name for hantavirus? How much fallopian tube is usually removed during a partial salpingectomy?