3. Exhaustion or Unusual Tiredness
As mentioned above in the section on rapid heartbeat, most types of illness tend to cause the body to work harder than usual in order to defend you from harm – a blood clot is just one of these illnesses. When your body is over-worked due to an illness, it will usually make you feel exhausted or at least more tired than you normally would be.
Because this symptom is quite vague in that it is not specific to any one illness, it is important to take into account along with one or more other symptoms. If you have been feeling overly tired for seemingly no reason at all – no strenuous activities and no lack of sleep in the recent past – then you should consider whether it is being caused by an illness. However, as mentioned, this is not specific to a blood clot so you should get professional help to find out the root cause.