There are numerous reasons you might be feeling tired. These include causes that are: psychological, e.g. stress, anxiety, depression; physical, e.g. hypothyroidism, anaemia, sleep apnoea; and lifestyle-related, e.g. night shifts, alcohol consumption, and getting too little or too much exercise. Many Vitamin and mineral deficiencies can cause tiredness and fatigue. If you are feeling tired all the time (TATT), it is well worth speaking to your GP and having a set of blood tests done. Get A Drip also offers a range of Blood Testing Profiles for diagnostic purposes. Low levels of Vitamin B12, other B Vitamins, Vitamin D, Iron and overall hydration can especially wreak havoc on your energy levels.