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A period is too heavy when you soak a pad or tampon hourly for hours, pass large clots, or bleed longer than 7 days.

Small streaks can come from hemorrhoids, but repeat bleeding, clots, black stools, or faintness calls for urgent care.

Bleeding that soaks a pad in an hour, passes clots, or comes with pain, dizziness, fever, or fluid leakage needs urgent same-day care.

In many adults, losing 40% of blood volume (often near 2 liters) can be fatal without rapid bleeding control.

Many adults can faint after a sudden loss near 20–30% of total blood volume, with risk rising fast if bleeding keeps going.

Most adult transfusions start with 1 unit of red cells (often 250–350 mL), then the team checks labs and symptoms before giving more.

In adults, losing about 30–40% of total blood volume can turn life-threatening without fast treatment.

Bleeding that soaks a pad or tampon each hour for several hours, lasts past 7 days, or leaves you weak or dizzy is too heavy.

Small streaks or a few drops can happen, but nonstop bleeding, clots, bowl water turning red, dizziness, or weakness means it’s too much and needs urgent care.

Implantation bleeding is usually just light spotting—often a few drops or faint streaks that may show on toilet paper or a liner, not a full flow.