Your Pothos needs water to survive. Water is essential, as it brings nutrients and moisture into the stems and leaves. However, too much water can cause problems for your houseplants.
Similar to overwatering, underwatered pothos can develop brown leaves and stems. Other symptoms of underwatering include curling, yellow leaves, wilting foliage, leaf loss, and in severe cases, dry, crispy leaves.
Pothos are susceptible to many fungal or bacterial diseases, such as bacterial leaf spot, blight, or root rot. These diseases will be more present in plants in bad health due to over- or underwatering or neglect.