Does thick saliva indicate anything bad?

Not always. Could be normal for some people. Best to get checked out by a dentist.
Thick Saliva. Thick saliva can be caused by dehydration, post nasal drip, allergies, sinusitis, upper respiratory infections, diabetes, hypoglycemia and radiation therapy. Also foods, chemo and medications.
Thick saliva. It may be that your mouth is dry from not drinking enough fluids, from medications you are taking, or from a metabolic problem such as diabetes. Try drinking enough water to keep your urine very light in color, review any medication's side effects, and if the sensation continues, see your doctor for further evaluation.