Thanks for the question. It's hard to say exactly what is happening with symptoms that have just started in the last few days, so it is important to speak with your doctor
. While there is a chance that this could be something serious that requires urgent medical attention, there is a chance, perhaps a greater chance, that this is something simple that will resolve itself. For example, most of us, when we start to come down with a viral illness
or another infection, will start to have some weakness. Even conditions as simple as an upper respiratory tract infection will require large amounts of energy from the body to be able to mount the immune response necessary to help you get better. A dry mouth could be a sign of something like this as well. Likewise, sleep deprivation, fatigue, and other common factors can play a role. If you have had none of these common causes, then it is good to consider other possibilities. Some of these include conditions that cause generalized fatigue such as diabetes, anemia
, etc. Others are more localized, and generally tend to affect a specific body part. Without more information and a physical exam, it will be hard to help further. Please speak with your doctor.