This is dehydration. You need to increase your fluid intake. Dark coloured urine is a strong indicator of low fluids, so increase your intake with water as opposed to softdrinks. Keep your kidneys flushed to avoid problems.I have bright yellow urine today - does anyone know why this is and what I should do? Thanks
Berocca is bad for this as well, at it turns urine to a luminous green colour.Asparagus can do this to some degree to some people.