1 No early symptoms. 2  Blood in the urine - often intermittently. 3  Kidney area lump. 4  Abdominal swelling.  No pain - there is not usually any kidney pain unless the tumor is very advanced.
Gas content varies depending on what sort of material melted to form the magma. As a general rule, the most explosive eruptions come from magmas that have high gas levels and high viscosity, while the most subdued eruptions come from magmas with low gas levels and low viscosity.
Magma contains dissolved gases, which provide the driving force that causes most volcanic eruptions. As magma rises towards the surface and pressure decreases, gases are released from the liquid portion of the magma (melt) and continue to travel upward and are eventually released into the atmosphere.