The symptoms you describe sound like they could be from either allergies or an upper respiratory cold since, as you point out, often they can present in a very similar way. A good way to help determine whether you have a cold or allergies (or both!) is to visit your primary care physician
to discuss your symptoms in more detail. An upper respiratory cold, usually caused by a virus, is usually characterized by a relatively acute onset of symptoms including nasal congestion, fatigue, low-grade fevers, cough, or sore throat
. After several days, usually not more than a week, things usually go back to normal. On the other hand, people with seasonal allergies will have symptoms for the duration of exposure to their triggering allergen. If the substance provoking the allergic reaction is from something like grass or pollen, symptoms can last for weeks or more. Unlike a cold, allergies do not usually cause fevers or discolored nasal discharge or phlegm. However, they do cause watery or red eyes, a runny nose, and sneezing. Symptoms can disrupt sleep, making a person more fatigued, while post-nasal drip can contribute to a sore throat.
Overall, your doctor
will want to discuss your symptoms in more detail and put this together with a physical exam to determine if you have a cold that will eventually go away versus seasonal allergies that can be effectively treated with one of several different allergy medications.