Have you recently noticed a lot of hair falling and you are unknown to the reason. There is nothing to panic as with advancement in medical science even bald people can be cured through hair transplant surgery or hair replacement procedure or through medication, but before you opt out any of these hair restoration options, let us discuss few of the very common reasons that trigger hair fall. Hair loss reasons Stress or Illness: If you recently been through any physical or emotional stress or a chronic illness, this can trigger a sudden hair fall.